The preposition you need is about.

We've all worked really hard this week. Let's go out for coffee and just talk in English.

Please don't be late again. It disrupts other people's lessons.

You look a bit tired. Are you getting enough sleep?

No, that's not the right verb, John.

I want you in groups of three. A, B, C, A, B, C ...

Aha! I thought you knew that. Let's do a little more work on it tomorrow.

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