Rewrite the sentences. 16) Six years ago we started writing to each other. 17) Peter was very tired because he had to finish his work before going out

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……………………………………………………………………