Оч безотлагательно,даю 25Which sentences are correct?1 I wish I could swim

Оч срочно,даю 25
Which sentences are correct?
1 I wish I could swim but I am still afraid of water.
2 If only they would keep silent for a minute!
3 If only I know the answer.
4 I will read more books if I had some free time.
5 If I had woken up earlier I wouldn't have missed the train.
6 I wouldn't argue with them if I am in your position.
7 Which sentences are correct?
8 I was told that water boils at 100 degrees.
9 He advised his friends that they visit this church when 10 they are in Swansee.
11 They suggested going for a swim later on.
12 Robert regretted to have mentioned the news to his family.
13 I informed everyone that the meeting had been cancelled.
14 Mary said to me that she was watching a film at that time.
15 Which sentences are correct?
16 I am not sure but he should have been at the university at that time.
17 You should have told me that earlier! I wouldn't have мейд such a silly mistake then!
18 Jane must have studied French for a long time. She speaks very well,
19 You may have won the prize in last month's competition. 20 You are one of the best students.
21 You have may known the right answer, you read that book.
22Tom must did his homework by lat Friday.