Answer Key
Exercise 2
Are the sentences correct?
1. You mustn't forget what I told you. It is very important.That is correct.
2. Who could have done that? - - - I don't know. But it definitely can't have been Paul because he was out of town.That is correct.
3. You‘d better clean it up before George comes back home.That is correct.
4. Yesterday I had to give a speech to 200 students. Speaking in public for the first time, you know. - - - Wow! You must be nervous!That is incorrect. Correct is: must have been
5. Don't say it didn't happen! How can you be so sure? Come on, it may happened.That is incorrect. Correct is: may have happened
6. You should talked to you boss about the problem.That is incorrect. Correct is: should have talked
7. It can't be the printer! I checked it and it looks ok. The problem must be in the cable.That is correct.
8. You weren't allowed changing any of it. You were supposed to be there and wait until I came!That is incorrect. Correct is: allowed to change
9. I can stay in bed tomorrow morning because I mustn't go to work.That is incorrect. Correct is: I don't have to go
10. I know his performance was not very good. He will shape up! Next time should be much better!That is correct.