Two-minute lessons on the mistakes you keep making

A grammar book explains every rule once, in order. You only need the few you keep getting wrong, and you need them when they come up. Lessons are made for that.

When a lesson turns up

Björn keeps track of the corrections you get in every app. When the same kind of mistake comes back three times, or twice in two different apps, the app you're in offers a lesson on it. You can take it then or save it for later.

What's in one

• Your own sentences, the ones you got wrong, put right.
• The rule in one line, with a few examples.
• Five quick questions to try it out.
• One sentence of your own that uses it, checked.

It takes about two minutes, and it leaves cards behind in Cards so the pattern comes back in your reviews.

When it's learned

Fix the same mistake yourself three times in a row, in a letter or a conversation, and the pattern counts as learned. Your lessons, started, ready and finished, are all in one list.