Sure, I can help you with these exercises. Let's rearrange the given words and rewrite the sentences:

31. The government are going to cut off some welfares next year.

32. How did you get to Hoi An Ancient Town in Quang Nam?

33. Before leaving his office, he went into to fill in the daily time sheet.

34. Since the last time I saw you, you have changed a lot.

Now, let's rewrite the sentences without changing their meanings:

35. Having switched off the lights, we went to bed.

36. Not having dedicated much in his previous job, he regretted it.

37. It was my English book that I have lost.

38. Uniform had to be worn by her at work yesterday.

31. The government are going to cut off some welfares next year.

32. How did you get to Hoi An Ancient Town in Quang Nam?

33. Before leaving his office, he went into to fill in the daily time sheet.

34. Since the last time I saw you, you have changed a lot.

Now, let's rewrite the sentences without changing their meanings:

35. Having switched off the lights, we went to bed.

36. Not having dedicated much in his previous job, he regretted it.

37. It was my English book that I have lost.

38. Uniform had to be worn by her at work yesterday.