Modal verbs (mustn't/don't have to/doesn't have to)

I can sleep late tomorrow morning because I ____ go to work.

• mustn't

• don't have to

Whatever you do, you ____ touch that switch. It's very dangerous.

• mustn't

• don't have to

There's a lift in the building, so we ____ climb the stairs.

• mustn't

• don't have to

You ____ forget what I told you. It's very important.

• mustn't

• don't have to

Silvia ____ get up early, but she usually does.

• mustn't

• doesn't have to

Don't make so much noise. We ____ wake the children.

• mustn't

• don't have to

I ____ eat too much. I'm supposed to be on a diet.

• mustn't

• don't have to

You ____ be a good player to enjoy a game of tennis.

• mustn't

• don't have to

I don't want anyone to know about our plan. You ____ tell anyone.

• mustn't

• don't have to

Richard ____ wear a suit to work, but he usually does.

• mustn't

• doesn't have to