Rewrite the sentences

16. Six years ago we started writing to each other.

=> We have……………………………………………………..

17. Peter was very tired because he had to finish his work before going out.

=> Peter had to……………………………………………………………..

18. We haven’t got any money, so we can’t go out tonight.

=> We……………………………………………………………………….

19. They usually wore jeans when they were young.

=> They used………………………………………………………………..

20. I don’t know many English words.

=> I wish……………………………………………………………………