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Task is to rephrase the sentences with the words in brackets

1. What was the reason she wouldn't allow her son to buy the book?
[let]
Why she wouldn't let her son to buy the book?

2. "It'd be better if you went on Tuesday", travel agent told Jim.
[advised]
The travel agent advised Jim to went on Tuesday.

3. I won't go to that party unless I'm invited.
[they]
I won't go to that party if I'm not invited.

4. The Committee are still discussing the project.
[still]
The project is still being descussed by the Committee.

5. I can't give you a lift, because my car is being repaired at the moment.
[my]
I can't give you a lift, because I have my car being repaired at the
moment.

6. "Why don't you ask your colleagues?" I said to him.
[that]
I suggested him that he should ask his colleagues.

7. The film was so funny that we laughed all the time when watching it.
[help]
We couldn't help stop laughing while we watched the film.

8. "Did you find the answer to my question?" asked Jim.

Jim asked whether I had found the aswer to his question.

Thank you
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1-- right idea, but a couple of grammar errors
2-- wrong verb tense
3-- you didn't use 'they' in the revision
4-- check your spelling
5-- 'my' is already in the first sentence. I don't think you typed carefully.
6-- suggested to him
7-- delete 'stop'
8-- check spelling

It is important that you carefully proofread what you have typed before you post it.
Comments  
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I've tried to correct these sentences according to your suggestions.
I'm not sure about first and fifth.

1. Why she didn't let her son to buy the book.

If the original sentence were phrased this way
"What was the reason she didn't allow her son to buy the book?"
would it be incorrect?

2. The travel agent advised Jim to had gone on Tuesday.
3. I won't go to that party if they don't invite me.
4. The project is still being discussed by the Committee.
5. I can't give you a lift, because I have a car being repaired at the
moment.
6. I suggested to him that he should ask his colleagues.
7. We couldn't help laughing while we watched the film.
8. Jim asked whether I had found the answer to his question

Thank you Mr. Micawber, I apologize for my stupid mistakes.
1-- 'why would't she let her son buy the book?'-- question word-order; no 'to'
2-- 'advised Jim to go'
3-- right
4-- right
5-- 'because I'm having my car repaired'
6-- right, and you should omit 'should', at least in AmE
7-- right
8-- right, and add a period.
Last question. Why sholud be 'being' omitted in fifth sentence?
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Because 'I have a car being repaired' is an awkward way of saying 'I'm having my car repaired', and in addition does not indicate whose car it is.