6. Correct the errors.
1. Are you wearing a new coat?
2. "How long has he been here?" she asked.
3. When he came home he saw that his sister had gone away.
4. If he comes I'll give him a message.
5. She has been doing her homework for four hours and haven't finished, yet.
6. What do you think we have been doing ever since he came here?
7. By the time you finish cooking, they will have done the washing up.
8. If she passes her exams successfully she will go to Italy.
9. Yesterday about 11 o'clock he was walking along Pennsylvania Avenue.
10. I had hardly left home when it began to rain.