Sure! Here are the rewritten sentences:

1. This house was built last month by them.
2. She asked me, "What is your name?"
3. I was asked by her.
4. I wish you wouldn't make so much noise.
5. Food cannot be sold on the sidewalk.
6. They have been learning English for 4 years.
7. We started the test.
8. The test was very difficult; we could not do it.
9. He told me, "I am very busy today."
10. He mentioned he was busy today.
11. Someone has stolen my bike.
12. I wanted to know where you bought these postcards.
13. I was asked by her.
14. The garden is too small to play football in.
15. The garden is small.
16. She knows more about it than I do.
17. They need to change the meeting date.
18. The meeting date will have to be changed.
19. Maria will be ready at any moment, and we must leave then.
20. We must leave as soon as Maria is ready.
21. She regrets not spending less money.
22. It’s unfortunate that she has to do her homework.
23. I wish she didn’t have to do her homework.
24. It will rain cats and dogs tomorrow, I wish it wouldn't.
25. He is currently not here.
26. I wish he were here.
27. I wish the two boxers weighed the same.
28. There is no difference in their weight.
29. He hates being asked about his past.
30. He dislikes questions about his past.
31. She had never been there before.
32. Neither had she been there previously.

Feel free to modify any specific phrasing as needed!