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11. He (teach) at school for five years when the war broke out.

12. Hi! What you (do) here since morning?

13. By the end of this year he (read) about two hundred pages.

14. When you (see) him last?

15. Don't ring me up at 11 o'clock, I (sleep).

16. 'You (find) your note-book?' 'No! I still (look) for it. I already (look) for it for two hours, but (not yet find) it.'

17. They (sail) down the river for many hours before they come to the village.

18. At last the librarian gave me the book which I (wait) for during two months.

19. He (write) the composition for three hours and he said he (finish) it soon.

20. On entering the drawing-room he (find) that his two friends (get) up and (wait) for him.

11. had taught

12. What have you done ...

13. has read

14. When did you see him last?

15. sleep

16. Have you found ... ? I still look for it.

I have already looked ..., but I haven't found it yet.

17. They will have been sailing.

18. I have waited ...

19. has written ... he will finish ...

20. On entering the drawing-room he had found that his two friends got up and were waiting for him.

11. He had been teaching at school for five years when the war broke out.

12. Hi! What have you been doing here since morning?

13. By the end of this year he will have read about two hundred pages.

14. When did you see him last?

15. Don’t ring me up at 11 o’clock, I will be sleeping.

16. ‘Have you found your note-book?’ ‘No! I am still looking for it. I have already been looking for it for two hours, but have not found it yet.’

17. They will have been sailing down the river for many hours before they come to the village.

18. At last the librarian gave me the book which I had been waiting for during two months.

19. He had been writing the composition for three hours and he said he would finish it soon.

20. On entering the drawing-room he found that his two friends had up and were waiting for him.