MODAL VERBS - EX ONE (4A)

I have to finish this essay, so I can't go out.

• correct

• incorrect

I must finish this essay, I really want to do well.

• correct

• incorrect

I didn't need to catch a taxi home from the airport. My brother picked me up.

• correct

• incorrect

I needn't have caught a taxi home from the airport. My brother would have picked me up.

• correct

• incorrect

You don't have to go to the lecture this afternoon. It's optional.

• correct

• incorrect

You mustn't go to the lecture this afternoon. It's only for first-year students.

• correct

• incorrect

After a lot of effort, I could finally start the car engine.

• correct

• incorrect

After a lot of effort, I finally managed to start the car engine.

• correct

• incorrect

He can stay for up to 90 days with this kind of visa if he wants to.

• correct

• incorrect

He could stay for up to 90 days with this kind of visa if he wanted to.

• correct

• incorrect