16.Hello! Did you just arrive?

17. –...

– I have already posted it.

18. –...

– He has already gone.

19.Has it stopped raining yet?

20.I wrote the letter but I haven't posted it yet.

B.

1. I lost it.
2. He told me his name yesterday but I forgot it.
3. No, she went out.
4. Have you seen it?
5. I cut my finger.
6. There was an accident.
7. The police arrested two man in connection with the robbery.
8. It was warm so I took off my coat.
9. I didn't enjoy it very much.
10. I knew Sarah was very busy, so I didn't disturb her.
11. I was very tired, so I went to bed early.
12. I didn't sleep very well.
13. Sue wasn't hungry, so she didn't eat anything.
14. We went to Kate's house but she wasn't at home.
15. –...– No, thanks. I have just had lunch.

B

1. I didn't enjoy it very much.
2. I knew Sarah was very busy, so I didn't disturb her.
3. I was very tired so I went to bed early.
4. I didn't sleep well.
5. Sue wasn't hungry, so she didn't eat anything.
6. We went to Kate's house but she wasn't at home. She was studying at the library.
7. They were having dinner from 2 to 3.
8. It was a funny situation but nobody was laughing.
9. The window was open and birds were flying into and out of the room.
10. It didn't cost very much.
11. Who was cooking the cakes when Sue phoned?
12. I didn't want to go to the zoo because it was raining.
13. I called Roger last night, but he wasn't at home. He was playing tennis.
14. He cried a lot when he was a baby.
15. I saw him again only yesterday.
16. As teenagers, we always understood each other very well.
17. I hardly knew Ray's wife.
18. We were meeting last Sunday from 5 to 7 o'clock.
19. I found this very old bottle yesterday.
20. Who left it open last time?