Who can tell me where is are the mistakes? Thank you so much

1. If it were is going to rain tomorrow, what will you do?
2. I would give it to medicine medical research, if I got a lot have plenty (oodles) of money.
3. This old man had 2 millions dollars, and he gave it to charities. No comma before "and"
4. He should eat lots plenty of fruits and vegetables and drinks lots plenty of water. Use "many", "much", "plenty" instead of "lots of" etc.  "Lots of" is too slangy for formal writing.
5. He doesn’t know if should he bring a present when invited.
6. If we had left earlier this morning, we wouldn’t miss the bus.
7. If you don’t know anyone, you can talk about to Tom.
8. If I were you, I would talk to someone who looks friendly
9. If I were you, I would take a long walk before going to bed.
10. I can’t sleep with the night before taking a big major exam.
11. I don’t have a gift, what if and if everyone else brings a gift one, what should I do?.
12. Confident people dare are able to speak in the public without difficulty.
13. They are both going to the concert this evening.
14. I really need it because of I have a math test.
15. In my dream, I was swimming in an ocean of papers.
16. I am really anxious, because I can’t find out my backpack. No comma before "because"
17. Strange things are happeninged in our neighborhood. Or "Strange things happened in ..."
18. Have you ever been in to another country?
19. Social situations aren’t bother bother you in the least slightest.
20. Sometimes you might may annoy people because you’re so confident.

Who can tell me where is mistake? Thank you so much

1. If it were to rains tomorrow, what will you do?

2. I would give it to medicine research, if I got a lot of money.

It is better if we rearrange it.

If I get a lot of money, I would give it for medicine research.

3. This old man had 2 millions dollars, which and he gave it to for charities.

4. He should eat lots of fruits and vegetables and drinks lots of water.

5. He doesn’t know if he should bring a present when invited.

6. If we had left earlier this morning, we would not have missed n’t miss the bus. 

7. If you don’t know anyone, you can talk about to Tom.

8. If I were you, I would have talked to someone, who looks friendly.

9. If I were you, I would have taken a long walk before going to bed.

10. I can’t sleep with the night before taking a big exam.

11. I don’t have a gift, what if everyone else brings a gift.

12. Confident people dare to speak in the public.

13. They are both going to concert this evening.

14. I really need it because of I have a math test.

15. In my dream, I was swimming in an ocean of papers.

16. I am really anxious, because I can’t find out my backpack.

17. Strange things are happened happen/happened in our neighborhood.

18. Have you ever been in another country?

19. Social situations aren’t don't bother you in the slightest.

20. Sometimes, you might annoy people because you’re so confident.

Who can tell me where is there a mistake? Thank you so much.

1. If it rains tomorrow, what will you do?
2. I would give it to medicine research, if I got a lot of money.
3. This old man had 2 millions dollars, but he gave it to charities.
4. He should eat lots of fruits and vegetables and drinks lots of water
5. He didn't know whether he should  bring a present when invited.
6. If we had left earlier this morning, we wouldn’t miss the bus
7. If you don’t know anyone, you can talk with Tom.
8. If I were you, I would talk to someone who looked  friendly.
9. If I were you, I would take a long walk before went to bed.
10. I can’t sleep in the night before take a big exam.
11. I have no gift, what if anybody else brings a gift.
12. Confident people dare to speak in public.
13. Both of them are going to concert this evening.
14. I really need it because  I have a math test.
15. In my dream, I was swimming in an papers of ocean  .
16. I am really anxious, because I can’t find out my backpack.
17. It is happened Strange things in our neighborhood.
18. Have you ever been to any other country?
19. Social situations doesn't bother you in the slightest.
20. Sometime you might annoying  because you’re so confident.