Помогите написать дз по английскому...Я в недоумении просто:

I. Make the following sentences a) interrogative; b) negative.

1. They have travelled a lot. 2. I have never been to London. 3. She has visited China twice. 4. This is the first time he has driven a car. 5. Tom has met many interesting people. 6. She has already translated this article. 7. Nick has just seen him. 8. He had translated the article by Thursday. 9. The secretary had sent all the faxes off when he came. 10. When we got to the hall, the concert had started. 11. She will have done the job by the beginning of the week. 12. We’ll have arranged everything necessary before the delegation arrives. 13. They’ll have completed the construction by the end of May.