1. Sylvia doesn't have enough money, so she can't buy a new computer.
__If Sylvia had enough money, she'd buy a new computer.
2 The twins don't see their friends often because they're very busy.
__If the twins weren't so busy, they would see their friends often.
3 I don't live in a city, so there's not much to do in the evening.
__If Iived a city, there would be lots to do in the evening.
4 Grandma won't get a dog because she lives in a small flat.
__If Grandma didn't live in a small flat, she'd get a dog.
5 You use your mobile a lot, so you have large phone bills.
__If you didn't use your mobile so much, you wouldn't have large phone bills.
6 I think you should tell your parents the truth.
__If I were you, l'd tell your parents the truth.

1. had

2. would see

3. lived

4. didn't live

5.wouldn't have 

6. were

=> Tất cả các câu này thuộc câu điều kiện loại II: If S+V-ed/S+ would +V