Memory

How do you turn passive vocabulary into active vocabulary?

Passive (receptive) vocabulary is the words you recognise when you read or hear them; active (productive) vocabulary is the words you can recall and use yourself when you speak or write. The active one is always smaller, and a word moves into it when you have to retrieve it from memory and produce it: flashcards from meaning to word, saying words before you hear them, writing sentences and retelling what you read.

By the Readlang Mobile team · Updated 2 November 2026

What is the difference between active and passive vocabulary?

Passive, or receptive, vocabulary is the words you understand when you meet them in reading or listening. Active, or productive, vocabulary is the words you can bring up yourself when you want to express a meaning in speech or writing (Nation, 2001, pp. 24–25). The difference is the direction of the task: receptive use starts from the form of the word and goes to its meaning; productive use starts from a meaning and has to find the form, spell or pronounce it, and fit it into a sentence.

Researchers split the active side further. Batia Laufer (1998) distinguished controlled active vocabulary, words a learner can produce when a task asks for them, from free active vocabulary, the words a learner actually chooses in their own writing. The two are not the same: a learner may produce a word on a test and still never use it in an essay.

Laufer and Goldstein (2004) went further and described four levels of knowing a word's meaning, which together they called the strength of knowledge. The examples below are ours, for an English speaker learning Spanish:

The two passive levels start from the foreign word, the two active levels from the meaning. Speaking needs the last one: in conversation nobody offers you four options to choose from.

Is there a fixed order from passive to active?

Yes, on average. Laufer and Goldstein (2004) built a computerised bilingual test of all four levels and tried it with 435 learners of English as a second language. The results supported the order in the table above at all the word frequency levels tested: passive recognition was easiest and active recall hardest. Passive recall, supplying the meaning of a foreign word, was the level that best predicted the learners' classroom performance in English.

A later study found the same pattern for other kinds of word knowledge. González-Fernández and Schmitt (2020) tested 144 Spanish learners of English on four components of knowing a word: the link between form and meaning, derived forms, multiple meanings and collocations. Across the components, recognition was acquired before recall.

So the order is a reliable rule of thumb: a word is usually recognised long before it can be recalled, and recalled from the foreign side before it can be produced from the meaning.

How much bigger is passive vocabulary?

There is no fixed ratio. Every study finds passive vocabulary larger than active, but the size of the gap depends on the learners, on how often the words occur in the language, and on how strictly a test counts a word as known. In a study of several groups of sub-degree students, May Fan (2000) found no consistent ratio between active and passive knowledge at all.

Two patterns run through the studies. The gap grows as passive vocabulary grows, because learners keep adding words they recognise faster than words they can use (Laufer, 1998). And the gap is widest for less frequent words (Webb, 2008): common words get used, rare ones mostly get recognised. Webb also found that learners with larger receptive vocabularies tended to know more words productively, so building passive vocabulary is not wasted on the way to active use.

For native speakers, the figures behind the usual claim that the active vocabulary is less than half the passive one are discussed on our page about how many words the average person knows and uses.

Why can you recognise a word but not recall it?

Because recognising and recalling are different tasks, and recall needs a stronger memory. When you read a word, the form is in front of you and only has to trigger a meaning. When you want to say it, you start from the meaning and have to find the form yourself, with no cue, and then pronounce or spell it correctly. A memory that is strong enough for the first task is often too weak for the second, which is why the levels in the table above are acquired one after another.

Reading leaves many words at the weak end. In Waring and Takaki's (2003) study, learners who had just read a graded reader containing 25 new words recognised the form of 15.3 of them, chose the right meaning for 10.6 and could translate 4.6. In a study of an unsimplified novel, readers recognised the meaning of 43% of new words they had met in it but recalled the meaning of only 14% (Pellicer-Sánchez & Schmitt, 2010). Even translating a word into your own language, passive recall, is harder than recognising it; producing the foreign word from its meaning is harder again.

Repetition narrows the gap but does not close it. For words met ten or more times in the novel, readers recognised the meaning of 84% and recalled the meaning of 55% (Pellicer-Sánchez & Schmitt, 2010). More on how many encounters a word needs is in our guide to learning words from reading. Neither study tested whether readers could produce the words themselves, which is the hardest level of all.

Which exercises move words into active use?

Exercises that make you start from the meaning and produce the word from memory. The common thread in the research is direction and retrieval: practising in the direction you need, from meaning to word, and producing the answer before you see it. The table sums up the main options; the sections below give the evidence.

Flashcards in the other direction

Most learners make cards that show the foreign word and ask for the meaning. That trains passive recall. For words you want to use, add a card that shows the meaning, or a sentence with a gap, and asks for the foreign word. Stuart Webb (2009) had Japanese university students learn English words in pairs in one direction or the other and tested each word in ten ways. Productive learning gave larger gains in receptive and productive knowledge of spelling and in productive knowledge of meaning, syntax and grammatical functions; receptive learning gave larger gains only in receptive knowledge of meaning. Webb concluded that if only one direction is used, the productive one may be the better choice.

Answer before you turn the card, out loud or in writing. Recalling an answer helps far more than looking at it again: in Karpicke and Roediger's (2008) study of Swahili words, students who kept testing themselves recalled about 80% a week later, against about a third for students who stopped testing after one correct answer. Our guide to spaced repetition explains how to schedule the reviews.

Say the word before you hear it

Repeating after a speaker feels like speaking practice, but it is copying. Kang, Gollan and Pashler (2013) taught people spoken foreign words with pictures. In one condition learners heard the name and repeated it; in the other they tried to say the name before hearing it. Tested straight away in one experiment and after two days in another, learners who had tried to recall the words understood and produced them better, and their pronunciation was no worse. With audio flashcards or a course, pause before the answer and say the word first.

Write sentences with the word

Writing your own sentence makes you use the word's form, grammar and typical company, not only its meaning. Webb (2005) compared reading glossed sentences with writing sentences, testing five aspects of word knowledge receptively and productively. When both tasks got the same time, reading came out ahead. When each task got the time it needed, and writing needed more, writing was more effective. The practical reading: writing costs more time per word, so use it for the words you want to use, not for every word you meet.

Retell what you read or heard

Retelling a chapter, an article or a video in your own words puts recently met words into use while the context is fresh. It belongs to what Paul Nation (2007) calls meaning-focused output, one of four strands he argues should each get roughly equal time in a course, alongside meaning-focused input, language-focused learning (deliberate study of words, grammar and other features of the language) and fluency development. Laufer and Hulstijn's (2001) idea of involvement points the same way: a task that makes you need a word, search for it and judge whether it fits helps it stay. We know of no study on retelling itself that would give a figure, so treat this as a sensible application of the research rather than a tested method.

Speak and write for real

Tests can show controlled active knowledge, but free active vocabulary appears only when you choose the words yourself. In Laufer's (1998) study, a year of school instruction raised the students' passive and controlled active scores but not the vocabulary they used in their own compositions. Conversation, messages, a diary or posts in the language are where controlled knowledge turns into words you reach for without being asked.

Does living in the country make words active on its own?

Eventually, but not quickly. In Laufer and Paribakht's (1998) study of 182 adult learners of English, the benefit of living in an English-speaking country showed up only after about two years. Learners of English as a foreign language in Israel had a smaller gap between passive and active vocabulary than learners living in Canada. In our reading of the studies above, production practice is what moves words to the active side; this study did not test it.

Should you make every word you know active?

No. Native speakers do not use every word they understand either, and the words you recognise but never use are still useful for reading and listening. Choose the words you need to say or write: the most frequent ones, which make up most of every conversation (see how many words you need for a conversation), and the words of your own work, studies and interests.

There is also a practical limit. A card in the other direction is a second card, with its own reviews. Counting cards, not words, 10 new words a day with reverse cards are 20 new cards a day; our calculation of daily review load shows what that does to the number of reviews. A reasonable rule is to add reverse cards only for words you have already met several times and want to use soon.

A weekly routine for activating words

This is our suggestion, built from the studies above rather than tested as a whole:

1. Each week, pick 10 to 20 words you already recognise and want to use: words that came up in your reading or listening and that you could have used yourself.
2. Make a card for each that shows the meaning or a sentence with a gap and asks for the foreign word. Say or write the answer before you turn it.
3. Write one sentence of your own with each word, about your life rather than the example sentence.
4. Once a week, retell something you read or watched, aloud or in writing, and try to use the week's words.
5. Use them with a person: a tutor, a language exchange partner or a message to a friend. Note the words you reached for and could not find; they are next week's list.

If you are just starting, the first-week plan sets up the reading and review habit that this routine builds on.

References

1. Fan, M. Y. (2000). How big is the gap and how to narrow it? An investigation into the active and passive vocabulary knowledge of L2 learners. RELC Journal, 31(2), 105–119. doi:10.1177/003368820003100205
2. González-Fernández, B., & Schmitt, N. (2020). Word knowledge: Exploring the relationships and order of acquisition of vocabulary knowledge components. Applied Linguistics, 41(4), 481–505. doi:10.1093/applin/amy057
3. Kang, S. H. K., Gollan, T. H., & Pashler, H. (2013). Don't just repeat after me: Retrieval practice is better than imitation for foreign vocabulary learning. Psychonomic Bulletin & Review, 20(6), 1259–1265. doi:10.3758/s13423-013-0450-z
4. Karpicke, J. D., & Roediger, H. L. (2008). The critical importance of retrieval for learning. Science, 319(5865), 966–968. doi:10.1126/science.1152408
5. Laufer, B. (1998). The development of passive and active vocabulary in a second language: Same or different? Applied Linguistics, 19(2), 255–271. doi:10.1093/applin/19.2.255; ERIC record
6. Laufer, B., & Goldstein, Z. (2004). Testing vocabulary knowledge: Size, strength, and computer adaptiveness. Language Learning, 54(3), 399–436. doi:10.1111/j.0023-8333.2004.00260.x
7. Laufer, B., & Hulstijn, J. (2001). Incidental vocabulary acquisition in a second language: The construct of task-induced involvement. Applied Linguistics, 22(1), 1–26. doi:10.1093/applin/22.1.1
8. Laufer, B., & Paribakht, T. S. (1998). The relationship between passive and active vocabularies: Effects of language learning context. Language Learning, 48(3), 365–391. doi:10.1111/0023-8333.00046
9. Nation, P. (2007). The four strands. Innovation in Language Learning and Teaching, 1(1), 2–13. doi:10.2167/illt039.0
10. Nation, I. S. P. (2001). Learning vocabulary in another language. Cambridge University Press. doi:10.1017/CBO9781139524759
11. Pellicer-Sánchez, A., & Schmitt, N. (2010). Incidental vocabulary acquisition from an authentic novel: Do Things Fall Apart? Reading in a Foreign Language, 22(1), 31–55. Full text (ERIC)
12. Waring, R., & Takaki, M. (2003). At what rate do learners learn and retain new vocabulary from reading a graded reader? Reading in a Foreign Language, 15(2), 130–163. ERIC record
13. Webb, S. (2005). Receptive and productive vocabulary learning: The effects of reading and writing on word knowledge. Studies in Second Language Acquisition, 27(1), 33–52. doi:10.1017/S0272263105050023
14. Webb, S. (2008). Receptive and productive vocabulary sizes of L2 learners. Studies in Second Language Acquisition, 30(1), 79–95. doi:10.1017/S0272263108080042
15. Webb, S. (2009). The effects of receptive and productive learning of word pairs on vocabulary knowledge. RELC Journal, 40(3), 360–376. doi:10.1177/0033688209343854