A: This is a very expensive book. You (mustn't/ don't have to) lose it. B: I promise I'll be careful.

I ( could / must) grow some flowers on my balcony, but I haven't decided yet.

A: You (must /have to ) be careful when you cycle on busy roads. B: Don't worry, I'm always careful.

That (mustn't / can't) be a carrot - it isn't orange!

Will she (have to / must) go to the store for vegetables tomorrow?

He (doesn't have to / mustn't) become a farmer, but he wants to

A: Why was Carl at home yesterday? B: It was a holiday. He (mustn't / didn't have to) go to school.

A: Why A: Why didn't you go to the café yesterday? Everyone was there. B: I wanted to, but I (must / had to) study for a test. must / had to study for a test.

When you see a spider, you (mustn't / don't have to) kill it. That's mean.

(Could / May) those birds be parrots?

A: He (mustn't/ doesn't have to) wash the car. I've already washed it. B: OK, I'll tell him

She's a famous author - she (can't / must) have a lot of money.

Bea (could / might) not come this weekend. She's going to call me later.