How not to forget a language you have already learned

Nobody warns you about the second half. You spend two years getting to the point where you can hold a conversation, then life moves, the lessons stop, and eighteen months later you open your mouth in that language and something embarrassing happens: you understand everything and can say nothing. The language is not gone. It has gone quiet, and quiet is reversible if you know which parts fade first.

Key points

• Production fades long before comprehension. You will still understand a film years after you have stopped being able to order in the language.
• The newest vocabulary goes first, and grammar you use daily is the most durable thing you own.
• Twenty minutes a week, spread over three days, is enough to hold a level. Getting it back later takes far less work than learning it did.

What fades, in what order

Language attrition is not a uniform fog. It has a shape, and the shape is useful.

• Active before passive. Retrieving a word is a harder operation than recognising it, so retrieval degrades first. That is the source of the tip-of-the-tongue stage, where you know exactly which word you want and cannot produce it.
• Recent before old. The words you learned last year are the least practised and the first to go. The hundred words from your first month tend to survive almost everything.
• Vocabulary before grammar. Sentence patterns you used constantly stay; the specific nouns evaporate.
• Speed before accuracy. Before anything is actually lost, everything slows down, and slowness is what makes people avoid speaking, which then accelerates the rest.

Attrition can begin within months of the last real use. It is also strongly affected by how well you knew the language: a level reached and used for years is far more resistant than a level reached in a sprint before an exam.

The good news is in the relearning

A language you have "forgotten" is not stored as blank space. Relearning it is dramatically faster than learning it the first time, which is why a month of serious review can restore what looked like three lost years. If you are reading this after a long gap, the honest advice is not to grieve but to start again at a level slightly below where you stopped and expect to be surprised by how quickly the old material comes back.

A maintenance budget

The cliff is between nothing and something. Twenty minutes is not a compromise, it is most of the benefit.

A week that takes twenty minutes

1. Ten minutes of review, split over two or three days. Spaced repetition exists precisely for this: it shows you the cards about to be forgotten and skips the ones that are safe, which is the whole trick of maintenance on a small budget.
2. One short text. A news item, an article, a chapter. Five minutes. Reading is the cheapest way to meet a large number of words per minute.
3. One spoken minute. Say what you did today, out loud, once. This is the part people skip, and it is the part that decays, so it is the part that matters. See speaking practice with nobody to talk to if the sound of your own voice is the obstacle.
4. One thing you actually enjoy, whenever. A podcast on the commute, a series in the background, songs. It costs no willpower, which is why it is the part that survives busy months.

Then protect it with a trigger rather than an intention: after coffee, on the train, before bed. A habit attached to something you already do survives a hard week; a plan to "keep it up" does not.

Three traps

The all-or-nothing rule. People who believe maintenance means an hour a day end up doing zero when they cannot find an hour. Ten minutes is not a failure, it is the programme.

Passive only. Watching series keeps comprehension alive and lets speaking rot, and because comprehension feels like the language, the loss is invisible until you next need to speak.

Two languages, one budget. When you add a new language, the older one goes quiet unless it gets its own slot. It does not need much, but it needs to exist. There is more on splitting attention in learning two languages at once.

In LinguaPair

Maintenance is what a spaced-repetition trainer is actually for, and the one here schedules by what you are about to forget rather than by a fixed list, so a maintenance week is genuinely ten minutes rather than a full review. Reading gives you a text a week on the free tier, which is exactly the weekly read above. The streak is built to survive real life rather than to punish a missed evening, and if you are learning in a pair, the shared streak is the most effective reminder anyone has invented: somebody notices. And when you do come back after a long gap, the placement test puts you where you are now, not where you left off, which makes the return much less discouraging than opening lesson one.