Best Language Proficiency Tests: Complete Guide for 2026

The best language proficiency test is whichever one your target language has settled on, and most languages have settled on exactly one. Japanese has the JLPT. German has the Goethe-Zertifikat. Spanish has DELE, Mandarin has HSK, Korean has TOPIK. English is the outlier, with five major exams competing for the same candidates.

Which means the real question isn't which test is best. It's whether the test your language offers is worth roughly $250 and three months of prep. This guide covers every major exam across 24 languages: what it costs, which CEFR level it maps to, how long the certificate stays valid, and who accepts it. If you haven't settled on a language yet, our best language by industry guide is the better place to start.

Table of Contents

• Tests in This Guide
• What Is CEFR?
• Tests by Language
• Costs
• When to Take a Test
• How to Choose a Test
• When Tests Help (and Don't)
• Which Tests Are Most Accurate?
• Your Test-Prep Toolkit

Language Proficiency Tests Covered in This Guide

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What Is the CEFR? The Language Proficiency Scale Explained

Nearly every major language test in the world maps to the Common European Framework of Reference for Languages (CEFR) — a six-level scale developed by the Council of Europe that has become the global standard for describing language ability.

The levels run from A1 (complete beginner) through C2 (full mastery), and they mean roughly the following in practice:

• A1–A2 — You can handle basic interactions: greetings, numbers, simple questions. You are not having a conversation.
• B1–B2 — You can manage most everyday situations and discuss familiar topics. B2 is broadly considered "independent user" — functional, but with limitations.
• C1–C2 — You operate fluently and flexibly. C1 is what most professional and academic contexts require. C2 is native-adjacent.

Most visa and immigration requirements sit at B1 or B2. Most university admissions requirements sit at B2 or C1. These distinctions matter when you're deciding which test, and which level, to target. For how long each level actually takes to reach, see our realistic CEFR timelines by language.

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Major Language Proficiency Tests by Language (2026)

Speaker figures are approximate 2025 totals (native + second-language) sourced from Ethnologue via the Wikipedia overview.

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Arabic

~335 million speakers. Arabic testing is more fragmented than any other major language — there is no single globally dominant exam equivalent to IELTS or JLPT. The landscape is improving, but slowly.

• King Salman Global Academy Test — The most credible government-backed option, aligned to CEFR A2–C1. Administered by Saudi Arabia's Arabic language authority and gaining recognition internationally.
• ALPT (Arabic Language Proficiency Test, Arab Academy) — Fully online, CEFR-aligned, broadly accessible.
• ACTFL Arabic OPI/OPIc — Via Language Testing International; used primarily for US government and academic contexts. Speaking assessment only.
• Arabic International Proficiency Exam — Administered by An-Najah National University; covers all four skills from beginner to distinguished.

A practical note: Arabic test recognition varies substantially by employer and institution. Verify which credential is accepted before registering.

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Bengali

~272 million speakers. Bengali has one of the largest speaker populations of any language without a portable, internationally recognized CEFR certificate — a situation parallel to Hindi.

• Bangla Sahitya Parishad — Conducts graded proficiency exams at multiple levels, covering reading, writing, comprehension, and grammar. Primarily India-focused.
• Avant STAMP2S — ACTFL-aligned, computer-adaptive assessment; used in US educational contexts and for Seal of Biliteracy purposes.
• ACTFL OPI via LTI — Spoken proficiency assessment rated on the ACTFL scale.

There is currently no globally portable CEFR diploma for Bengali equivalent to the DELF or Goethe-Zertifikat. If you need a formal credential, verify with your institution which assessment they recognize — options differ substantially between India, Bangladesh, and US/European contexts.

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Cantonese

~85 million speakers. No major CEFR-aligned international exam exists for Cantonese as a foreign language. The closest formal option is the COPA (Computerized Oral Proficiency Assessment) from the Chinese University of Hong Kong, which focuses on oral and listening skills. Learners typically rely on institutional assessments or university placements.

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Chinese (Mandarin)

~1.18 billion speakers. The dominant Mandarin Chinese proficiency system is administered by Hanban, the Chinese government's language education body. All three exams below share the same portal.

• HSK (Hanyu Shuiping Kaoshi) — The standard general proficiency test. A nine-level system (HSK 3.0), first proposed in 2021, had its official standards published in November 2025 and is rolling out through 2026. During this transition the legacy six-level HSK is still widely offered, with the new HSK 7–9 available as a separate advanced exam. Under the nine-level structure, Levels 1–3 map roughly to A1–B1; 4–6 to B2–C1; 7–9 to C1–C2.
• BCT (Business Chinese Test) — Designed for professional and workplace contexts.
• YCT (Youth Chinese Test) — For younger learners, covering elementary vocabulary and grammar.

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English

~1.53 billion speakers. English language testing is the most competitive and fragmented market of any language, driven by global demand for immigration and academic entry. Five exams dominate English proficiency certification worldwide:

• IELTS Academic — The dominant test for university admissions and immigration to the UK, Australia, Canada, and New Zealand. Scored 0–9; most universities require 6.5–7.5. Valid 2 years.
• TOEFL iBT (Test of English as a Foreign Language) — Administered by Educational Testing Service. Preferred by US universities and widely accepted globally. Scored 0–120. Valid 2 years.
• TOEIC (Test of English for International Communication) — Also from ETS, and the one most often left off guides like this despite roughly seven million sittings a year. It's a workplace credential rather than an academic one: the core Listening and Reading test is scored 10–990 and is used heavily for hiring and promotion decisions in Japan, Korea, and Taiwan. Speaking and Writing is a separate module. Not accepted for university admission or immigration.
• Cambridge English — The B2 First, C1 Advanced, and C2 Proficiency exams are considered the gold standard for demonstrating sustained, high-level English ability. Certificates don't expire, a meaningful advantage over IELTS and TOEFL.
• PTE Academic — Fully computer-marked; faster results (usually 48 hours). Accepted by most Australian and UK universities. Valid 2 years.

There's no single best English test, only a best English test for your destination: IELTS for the UK, Australia, and Canada, TOEFL for the US, TOEIC if the audience is an Asian employer, Cambridge if you'd rather never retake anything.

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French

~312 million speakers. France has a well-developed and internationally mature testing system, with distinct exams for different purposes.

• DELF / DALF — The core French proficiency diplomas, offered at all six CEFR levels (DELF covers A1–B2; DALF covers C1–C2). Administered globally through Alliance Française and partner centers. Certificates never expire — a significant draw for learners who don't want to retest.
• TCF (Test de Connaissance du Français) — The test to use for immigration applications to France. Specifically required for French nationality applications and many long-stay visas. Valid 2 years.
• TEF (Test d'Évaluation de Français) — Widely used for Canadian immigration, including Express Entry and provincial nominee programs. Valid 2 years. For Canadian immigration, IRCC accepts both TEF Canada and TCF Canada (not DELF) — either is valid, so choose based on format and test availability.

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German

~130 million speakers. German has an unusually complex testing landscape, partly because multiple institutions offer parallel certifications and partly because university entry requirements differ from immigration requirements.

• Goethe-Zertifikat — The gold standard for German as a foreign language, available at all six CEFR levels. Widely recognized for immigration (Germany, Austria, Switzerland) and employment. Certificates don't expire.
• TestDaF (Test Deutsch als Fremdsprache) — Specifically designed for university admission in Germany. Covers CEFR B2–C1. Required by most German universities for international students; not relevant for immigration.
• DSH (Deutsche Sprachprüfung für den Hochschulzugang) — A university-entry test administered by individual universities rather than a central body. Equivalent to TestDaF for admissions purposes, but availability depends on which institution you're applying to.
• ÖSD (Österreichisches Sprachdiplom) — The Austrian equivalent to Goethe-Zertifikat, covering A1–C2. Accepted interchangeably with Goethe across most contexts.

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Hindi

~609 million speakers. Hindi presents a genuine paradox: it's the world's third most spoken language by total speakers, yet it has less international test infrastructure than almost any language at its scale. No CEFR-aligned, globally administered exam equivalent to JLPT or DELF currently exists. The options that do exist are fragmented, domestically focused, and largely unknown outside of India.

• Dakshin Bharat Hindi Prachar Sabha — Graded exams (Prathamic → Praveen) primarily used within India.
• Hindi Sahitya Sammelan — Parallel graded system (Prarambhik → Acharya), also India-focused.
• ACTFL Hindi OPI — Available via Language Testing International; used mainly in US government and academic contexts.

The reason is largely English. It's a co-official language in India, the medium of higher education, and the working language of business and government in most urban centers, so the practical pressure to build formal Hindi credentials never materialized the way it did for Japanese or Korean.

If you need a formal Hindi credential, verify with your specific institution or employer which of the above they recognize, if any. Demand will drive standardization eventually; it hasn't yet.

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Indonesian

~199 million speakers.

• UKBI (Uji Kemahiran Berbahasa Indonesia) — The official Indonesian government proficiency exam, administered by the Ministry of Education. Seven levels; required for some professional roles and visa categories in Indonesia.

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Italian

~67 million speakers. Italy has three well-established parallel certification systems from different universities — all internationally recognized, all CEFR-aligned.

• CILS (Certificazione di Italiano come Lingua Straniera) — Offered by the Università per Stranieri di Siena at A1–C2. One of the two most widely recognized credentials; accepted for Italian citizenship applications.
• PLIDA (Progetto Lingua Italiana Dante Alighieri) — From the Società Dante Alighieri, available A1–C2. Also accepted for citizenship and immigration.
• CELI (Certificato di Conoscenza della Lingua Italiana) — From the Università per Stranieri di Perugia, offered across five levels equivalent to CEFR A2–C2.

For Italian citizenship applications, CILS and PLIDA are the most commonly specified credentials — verify requirements with your consulate.

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Japanese

~125 million speakers.

• JLPT (Japanese Language Proficiency Test) — The globally recognized standard, offered at five levels (N5–N1). N2 is the practical threshold for most professional roles in Japan; N1 for academic study. Results don't expire. Notable limitation: the JLPT does not test speaking.
• J-CAT (Japanese Computerized Adaptive Test) — An online adaptive test useful for placing yourself on the scale without the cost or scheduling constraints of JLPT. Not a credential — a diagnostic.
• BJT (Business Japanese Test) — For professional and workplace contexts; includes speaking.

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Korean

~82 million speakers.

• TOPIK (Test of Proficiency in Korean) — The single dominant exam, administered by South Korea's National Institute for International Education. Six levels in two tiers: TOPIK I (levels 1–2) and TOPIK II (levels 3–6). Required for university admission and most professional visa categories in South Korea. Certificates are valid for 2 years from the score announcement date.

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Portuguese

~267 million speakers. Portuguese splits into two distinct testing systems based on variety — Brazilian and European — and they're not interchangeable for most official purposes.

• CELPE-Bras — The only internationally recognized certificate for Brazilian Portuguese, administered by Brazil's Ministry of Education. Required for university admission and professional licensing in Brazil. Offered at four levels (Intermediário to Avançado Superior). Certificates don't expire.
• CAPLE — The European Portuguese system, offered by the University of Lisbon. Includes five named qualifications (CIPLE at A2 through DUPLE at C2). Required for Portuguese nationality applications.

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Russian

~253 million speakers.

• TORFL / ТРКИ (Test of Russian as a Foreign Language) — The official state-sponsored Russian proficiency exam, covering six levels from A1 (Elementary) to C2. Required for work permits and permanent residency in Russia. Now administered primarily online. Certificates don't expire.

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Spanish

~558 million speakers. Spanish has two major international certification paths, with different emphases and institutional backing.

• DELE (Diplomas de Español como Lengua Extranjera) — The oldest and most widely recognized Spanish certificate, administered by the Instituto Cervantes on behalf of Spain's Ministry of Education. Available at all six CEFR levels. Certificates have no expiry date.
• SIELE (Servicio Internacional de Evaluación de la Lengua Española) — A more recent exam developed jointly by the Universidad Nacional Autónoma de México, Universidad de Buenos Aires, Universitat de Barcelona, and Instituto Cervantes. It's adaptive, available online, and particularly strong for Latin American Spanish variants. Valid for five years.

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Swahili

~200 million speakers (native and L2 combined). Swahili is the most widely spoken African language and the official or co-official language of Kenya, Tanzania, Uganda, Rwanda, and the DRC. No standalone CEFR certificate currently exists for it as a foreign language — a notable gap for a language of this scale.

• ACTFL OPI, OPIc, and WPT via LTI — The primary formal proficiency option. Swahili is included in ACTFL's Seal of Biliteracy program as one of 24 less commonly taught languages. Tests are rated on the ACTFL scale and used in US academic, government, and professional contexts.
• Lugha Tests — A Swahili-focused assessment platform offering structured proficiency evaluations; an emerging option worth monitoring.

Development of a formal East African language certification framework has been discussed at regional level but not yet implemented. For learners targeting East African employment or study, verify with your specific institution which credential they require.

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Tamil

~75 million speakers. Tamil has several credentialing options backed by Indian government institutions, though international portability varies by context.

• CIIL CPT (Certificate of Proficiency in Tamil) — Conducted by India's Central Institute of Indian Languages, a government body under the Ministry of Education. Available at Basic, Intermediate, and Advanced levels; covers all core language skills.
• Tamil Virtual Academy (TVA) — A Government of Tamil Nadu initiative offering online Tamil courses and formal proficiency tests at multiple levels. Accessible globally.
• Avant STAMP2S — ACTFL-aligned, computer-adaptive; recognized for Seal of Biliteracy in several US states (Georgia, Maryland, Massachusetts, Virginia) via AJA Language Proficiency Assessment.
• ACTFL OPI via LTI — Spoken proficiency assessment available in Tamil.

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Thai

~60 million speakers. Thailand has two main official certification paths: one university-based and internationally recognized, one government-issued.

• CU-TFL (Chulalongkorn University Test of Thai as a Foreign Language) — Developed and administered by the Sirindhorn Thai Language Institute at Chulalongkorn University since 2013. Aligned to CEFR, ACTFL, and ILR standards. Assesses listening, reading, writing, and speaking; candidates may take the full integrated test or individual skill modules. Offered in multiple rounds per year; the most internationally recognized Thai proficiency credential currently available.
• TCT (Thai Competency Test) — Administered by Thailand's Ministry of Education; described as the only official government-issued Thai language certificate. Recognition is primarily domestic.

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Turkish

~82 million speakers.

• TYS (Türkçe Yeterlik Sınavı) — Administered by the Yunus Emre Institute, Turkey's state cultural and language body. Covering CEFR A2–C2, it is Turkey's first internationally recognized language proficiency exam. The TYS is offered at 93 Yunus Emre Institute centers across 69 countries — including locations across Europe, Asia, Africa, the Middle East, and North America — with further expansion into Latin America and Africa planned through 2026.

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Vietnamese

~95 million speakers. Vietnam has a structured, government-backed proficiency system for foreign learners that maps directly to CEFR.

• VLPT (Vietnamese Language Proficiency Test) — Administered by the Center for Vietnamese Language for Foreigners at VNU-HCM University of Social Sciences and Humanities. Six levels (A1–C2), aligned to Vietnam's national Vietnamese Language Proficiency Framework (KNLTV), which corresponds directly to CEFR. Tests all four skills: listening, reading, writing, and speaking. Offered five times annually (March, May, July, September, November). Certificates valid 2 years; accepted for university admissions, employment in Vietnamese organizations, and immigration purposes.
• ACTFL OPI via LTI — Speaking-only assessment available for those who need a formal spoken proficiency rating on the ACTFL scale.

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Languages With No Internationally Portable Certificate

Some languages have no CEFR-aligned diploma you can carry across borders the way you can carry a DELF or a Goethe-Zertifikat. In a few cases nothing formal exists at all. In others a state exam exists but is designed for immigration inside that country rather than for proving your level to an employer somewhere else. Either way, the practical answer is the same: verify what your specific institution accepts before you pay for anything.

Cantonese belongs in the same conversation. It has COPA and institutional placement testing, but no portable CEFR diploma either.

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Less Common Languages

Language Testing International runs proficiency assessment in over 120 languages, and for most of the ones below ACTFL OPI/OPIc and WPT via LTI is the primary formal credentialing path, often the only one. These language assessments are rated on the ACTFL and Interagency Language Roundtable scales, used in US academic, government, and professional contexts. No standalone CEFR-aligned certificates comparable to JLPT or DELE exist for these languages.

Two European languages have dedicated CEFR-aligned certificates through ECL, the European Language Certificates, run by the European Consortium for the Certificate of Attainment in Modern Languages:

Kazakh has its own state system: the KAZTEST, administered by Kazakhstan's National Testing Center (Ministry of Education). Required for some employment and university admission in Kazakhstan.

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What Does It Cost? 2026 Quick Reference

Prices vary significantly by country and test center. Figures below are approximate USD equivalents for mid-range markets; verify current fees with your local center before registering. Score validity refers to how long certificates or results are formally accepted.

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When You Should Take a Language Proficiency Test

There are specific situations where a language certificate isn't a nice-to-have — it's a hard requirement. If any of the following apply to you, stop reading this section and go book your test.

These aren't suggestions. You will not get your visa without the right score from the right exam, and university thresholds are equally non-negotiable. For where a certificate goes on the page and which label to pair it with, see our guide to listing language skills on a résumé.

The through-line here is that the certificate has value independent of what it reflects about your actual language ability. It's a key that opens specific doors. If you need one of those doors opened, get the key.

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How to Choose a Language Proficiency Test: Six Criteria

Once you know you need a certificate, the choice is usually between two or three exams, not twenty. These are the criteria that decide it, roughly in the order they should decide it.

1. Who accepts it. This overrides everything else on the list. A test is only worth what the institution reading your file says it's worth, and acceptance is narrower than most marketing suggests. IRCC accepts TEF Canada and TCF Canada for immigration but not DELF, however good your DELF is. German universities want TestDaF or DSH; German immigration wants Goethe-Zertifikat. Get the requirement in writing from the body that will read it, then pick backwards from there.

2. Whether it maps to CEFR. A CEFR-aligned result travels, because the proficiency level it names means the same thing to a university in Lisbon and an employer in Osaka. A proprietary band score has to be translated by whoever receives it, and translation is where a good result quietly loses value. Most major exams map cleanly. The ones that use their own scale, like the JLPT's N5–N1 or ACTFL's Novice–Superior, have well-understood equivalences but you should expect to explain them.

3. How long the certificate stays valid. This is the most underrated line in the whole decision, because it determines whether you pay once or repeatedly. DELE, DELF/DALF, Goethe-Zertifikat, Cambridge C1 and C2, CELPE-Bras, and TORFL do not expire. IELTS, TOEFL, PTE, TCF, TEF, and TOPIK are typically good for two years. If your timeline is uncertain, a lifetime certificate at a similar price is the better buy by a wide margin.

4. Which skills it actually tests. Exams differ enormously here, and the gaps are rarely advertised. The JLPT has no speaking component at all, so an N1 certifies reading and listening and says nothing about whether you can hold a conversation. PTE is entirely computer-marked. ACTFL's OPI is a live interview with a trained rater. If the ability you need to prove is spoken, pick an exam that evaluates it.

5. Cost, including the retake you might need. Sticker prices in this space range from about $30 to $340, and the spread is not a quality signal. HSK and TOPIK are cheap; IELTS and TOEFL are expensive largely because demand for them is enormous. Budget for one retake if you're testing near the top of your range, and factor in that an expiring certificate is a recurring cost.

6. Format and availability where you live. An exam offered twice a year in three cities is a different proposition from one offered on demand at a local center. JLPT runs in July and December. DELE has fixed sittings. SIELE and PTE are adaptive and near-continuous. Working backwards from an application deadline, the test calendar sometimes makes the decision for you.

Two criteria most learners weight too heavily: prestige and difficulty. Prestige matters only where the receiving institution recognizes it, and difficulty is a poor proxy for anything, because the language level you certify at is your choice.

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When a Test Helps, and When It Doesn't

For learners without an immediate institutional requirement, the question becomes personal: is a test a useful part of your language learning, or a distraction from it?

The Case for Taking a Proficiency Test

Some learners genuinely thrive under exam conditions. If you are the type of person who responds well to hard deadlines, measurable targets, and high-stakes accountability — a language test can be an excellent structural tool. Registering for a JLPT N3 in six months' time and working backwards is a legitimate strategy. The CEFR scale also gives you a shared vocabulary to describe your level to others, which is genuinely useful in professional contexts even when no formal requirement exists.

There's also a motivational function that shouldn't be dismissed. For certain learner profiles — particularly those who've studied a language for years without a concrete milestone — passing a formal exam provides a sense of closure and accomplishment that's hard to replicate. This is real, and it matters.¹

When a Language Proficiency Test Isn't Worth It

The case against is strong, and it centers on what tests actually measure.

Most major language tests are designed to be standardized, scalable, and objectively scorable. That means they heavily weight skills that are easy to mark: multiple-choice reading comprehension, grammar and vocabulary in isolation, formulaic writing tasks. Speaking tests — where they exist at all — typically involve recording yourself speaking into a microphone for a set time, following a structured prompt. The JLPT, notably, has no speaking component at all.

What this produces, predictably, is teaching to the test. Research on the washback effect — the influence tests exert on what and how teachers teach — has documented this extensively.² When a high-stakes test emphasizes grammar over discourse, learners study grammar over discourse. When it doesn't test speaking, speaking doesn't get practiced.

The result is a known phenomenon that any language teacher will recognize: the learner who scores B2 on a DELF exam and then struggles to follow a native speaker conversation at normal speed. The test measured something. It just didn't measure fluency.

There's also a cost-of-opportunity argument. IELTS preparation courses routinely run for 8–12 weeks. That's 8–12 weeks of studying IELTS-specific question formats, timing strategies, and genre conventions — time that could have been spent building vocabulary, consuming content in the language, or practicing conversation. For learners who don't need the credential, the trade-off rarely favors the test.

Finally: tests are expensive. A single IELTS attempt runs $295–$340 in the US; TOEFL is comparable. Factor in preparation materials and the total climbs quickly. That's real money that could fund a language exchange, a tutor, or a tool actually designed around acquisition.

The certificate isn't a lie. It's just measuring something other than whether you can actually use the language. Those aren't the same thing, and confusing them is expensive.

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Which Language Proficiency Tests Are Most Accurate?

"Accurate" is doing two different jobs in that question, and separating them is the whole answer.

The first job is reliability: does the exam give you the same result twice? On this measure the big standardized tests are excellent, and it's what most of their institutional credibility rests on. IELTS, TOEFL, and PTE are heavily psychometrically validated, item-banked, and calibrated across hundreds of thousands of test takers a year. Two people at the same level will get near-identical scores. That consistency is precisely why immigration departments trust them.

The second job is validity: does the exam measure the thing it claims to measure, which is your ability to use the language? Here the ranking looks completely different, and it turns on how much of the assessment is a live human judging unscripted performance.

By that standard, the ACTFL Oral Proficiency Interview is the most valid instrument in wide use, and the exams that follow it are the ones that put a human in the room. At the other end sit exams that produce very reliable numbers about narrower things.

The JLPT case is the one that causes the most trouble in practice: the missing speaking section is well known among Japanese learners and routinely forgotten by everyone reading the résumé.

There's a structural reason the gap persists, and it's the washback problem again. Everything easy to mark at scale is also easy to prepare for without acquiring much, so when an exam underweights speaking, courses underweight speaking, and the certificate ends up certifying preparation rather than ability.³⁴

So the practical answer: for proving a level to an institution, the most reliable exams are the standardized ones, and that's what the institution wants. For knowing where you actually stand, a live-rated speaking assessment tells you more in twenty minutes than a reading section does in two hours. The two answers pointing in different directions is not a flaw in the tests. It's the thing to plan around.

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Pick a Test-Prep Tool That Makes the Language Stick

A test measures a single day; the goal is language that's still there six months later, at speed, with someone who goes off-script. The right prep tool gets you both, the score and the staying power, by doing what practice papers can't:

• Point your study at the exam's actual vocabulary and structures, not a generic syllabus.
• Bank the language into long-term memory through spaced review, so it survives past test day.
• Train the speaking and off-script comprehension most exams underweight but real life demands.
• Show what you can actually use, not just what you can recognize on a multiple-choice line.

Atlas Runa turns language-test prep into practice that outlasts the exam. Hand it your target, an HSK list, a JLPT level, a DELE date, and it shapes your reading, review, and drills around reaching it. Spaced review resurfaces each word right before you'd forget it. Runa, the AI coach that already knows your level, corrects your writing and holds the kind of unscripted conversation most exams barely test. Walk in more ready than practice papers would leave you, and keep the language long after the certificate is filed.

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Test fees and requirements change frequently; verify current details with the relevant examining body before registering.

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1. Dörnyei, Z. (2001). Teaching and Researching Motivation. Pearson Education. ↩
2. Alderson, J.C., & Wall, D. (1993). Does washback exist? Applied Linguistics, 14(2), 115–129. ↩
3. Canale, M., & Swain, M. (1980). Theoretical bases of communicative approaches to second language teaching and testing. Applied Linguistics, 1(1), 1–47. ↩
4. Krashen, S.D. (1985). The Input Hypothesis: Issues and Implications. Longman. ↩