I forget everything by Friday — review on day 3, 14 and 45, not every night

The problem

Monday, you learn twenty words. Tuesday, you read them again. Wednesday too. Friday, you open the page and half of them are gone. You tell yourself you don’t have a good memory, or that French just won’t go in.

It’s not your memory and it’s not French. It’s the calendar. Reviewing every evening is the most tiring way to forget.

What the research found

We’ve known for over a century that learning in several spaced sessions beats learning in one block: this is the spacing effect, one of the most solid findings in all of memory research. A synthesis of 317 experiments (Cepeda et al., 2006) confirms it: for the same total study time, distributed practice beats massed practice in almost every case.

The interesting question is how much to space. Cepeda and colleagues (2008) had more than 1,300 people learn facts with a gap between two sessions ranging from minutes to months, then tested them up to a year later. The result fits in one rule: the ideal gap between two reviews is roughly 10 to 20% of the time until you’ll need the material. Sitting the TCF in three months? Review your words every two to three weeks, not every night. Want to remember a story in a month? Come back after three days, then two weeks.

And for a foreign language specifically? Kim and Webb (2022) pooled 48 studies of second-language learners. Spacing improves both vocabulary and grammar learning, and the effect is clearer when memory is measured long-term rather than the next day. In other words: cramming looks good on Tuesday’s test and bad on Friday’s.

Do this today

Take what you learned today and put three dates in your phone: in three days, in two weeks, in six weeks. When the day comes, you don’t re-read — you try to recall, then check. Five minutes is enough.

Between those dates, leave that set alone. Move on to something else. The feeling of having forgotten a little before you come back is not a failure: it’s exactly what makes the recall useful.

How our lessons use it

Every HumanFrench lesson is built to be revisited, not read once. After “Je m’appelle Nadia”, put three dates in your phone — day 3, day 14, day 45 — and each time, hide the text, recall the name, the city and what Nadia likes to do on Saturdays, then check. Five minutes, three times, and the story stops leaving.

Try it in Je m’appelle Nadia (A1): a short lesson, exactly what a first review needs.

The honest limit

Spacing makes what you understood stick. It doesn’t make you understand what you didn’t. If the story was too hard the first time, coming back on day 3 changes nothing: pick a Récit one level down, then climb. And the 10-to-20% rule is a rule of thumb drawn from experiments on isolated facts, not a precise law for each person: what matters is the real gap, not the exact day.

Your questions