Rewrite the sentences. use the words in brackets. 1. i'm sure he isn't here. (can't) 2. i'm sure you know the answer. (must) 3. i'm sure it isn't true. (can't) 4. i'm sure they have a lot of money. (must) 5. i'm sure he doesn't understand. (can't) 6. i'm sure it's him. (must)

1. I'm sure he can't be here.
2. I'm sure you must know the answer.
3. I'm sure it can't be true.
4. I'm sure they must have a lot of money.
5. I'm sure he can't understand.
6. I'm sure it must be him.