Choose the correct answer

1. He can't have been can't be French. His French is terrible.
2. The kids are calm today. They must have been must be had to be tired.
3. Although Leila was very hungry, she didn't eat very much. She couldn't have liked could have liked can't like the food.
4. The phone is ringing. It must be had to be must have been Mary. She promised she would call.
5. John had a terrible accident. He must stop had to stop when the traffic lights were red.
6. I don't know why she got so many bad grades. She may be might be might have been lazy studying.
7. I didn't know you needed help. You should have told should tell me.
8. I am so tired. I need some rest. I think I should take should have taken a week off.
9. He could have run can run could run so fast when he was young.
10. Nancy can't have gone can't go on holidy. I have just met her in the street.