Rewrite sentences using a modal verb

1. I'm sure he's at home.

• He must be at home.

• He should be at home.

It's impossible that he knew the problem.

• He must have known the problem.

• He can't have known the problem.

We have bought more food than was necessary for the party.

• We needn't have bought more food.

• We needn't buy more food.

I'm sure they didn't phone you.

• They can't phone you.

• They can't have phoned you.

It's just possible that he went to bed early.

• He must have gone to bed early.

• He might have gone to bed early.

If I were you, I'd tell the truth.

• You should tell the truth.

• You must tell the truth.

It is obligatory for you to wear a uniform.

• You have to wear uniform.

• You might wear uniform.

It is not necessary for them to cook lunch.

• They don't have to cook lunch.

• They can't cook lunch.

When she was ten years old, she had the ability to read people's minds.

• When she was ten years old, she managed to read people's minds.

• When she was ten years old, she could read people's minds.

It was careless of him to go without checking the time

• He mustn't go without checking the time

• He shouldn't have gone without checking the time