9. Are you going to mail these letters soon?

-> Are these letters going to be mailed soon?

10. He should have finished the report yesterday.

-> The report should have been finished yesterday.

11. Scientists began to carry out researches on SIDA two years ago.

-> Researches on SIDA were begun to carry out by scientists two years ago.

12. They say that he is the richest man in our town.

-> He is said to be the richest man in our town.

13. I can assure you I will arrange everything in time.

-> You can be assured everything will be arranged in time.

14. We are to pity rather than despise these homeless boys.

-> We are to pity rather than these homeless boys are despised.

15. We haven’t moved anything since they sent you away to cure you.

-> Nothing has been moved since they sent you away to cure you.