Ответ:
2 It would be better if she stayed with us.
3 I would feel lonely if I didn't have so many friends.
4 If he lived closer to me, we would see each other more often.
5 If I could swim, I would be able to sail around the world.
6 If he had better marks, he would be given a scholarship.
7 I would be glad if you didn't park your car here.
8 If I went to Brazil, I would meet some known football players.
9 If I won 1 million, I would buy a beautiful house.
10 I wouldn't accept her offer if I was supposed to decide.