Question

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Complete these sentences using must (have) or can`t (have).
Example: Is he British? Yes, he must be British. Did she see you? No, she can`t have seen me.
1. Are they married? Yes, they ...
2. Is he serious? No, he ...
3. Were they in a hurry? Yes, they ...
4. Does Ann know a lot of people? Yes, she ...
5. Did Tom know about the plan? Yes, he ...
6. Do they have much money? No, they ...
7. Was he driving carefully? No, he ...
8. Are they waiting for somebody? Yes, they ...

Answer 1

1. Are they married? Yes, they must be married.
2. Is he serious? No, he can't be serious. 
3. Were they in a hurry? Yes, they must have been in a hurry. 
4. Does Ann know a lot of people? Yes, she must know a lot of people. 
5. Did Tom know about the plan? Yes, he must have known about the plan. 
6. Do they have much money? No, they can't have much money. 
7. Was he driving carefully? No, he can't have driven carefully. 
8. Are they waiting for somebody? Yes, they must be waiting for someone ...