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.

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Công thức câu điều kiện:

• Câu điều kiện loại 1:  [If + thì hiện tại đơn],  [will + động từ nguyên mẫu]
• Câu điều kiện loại 2:  [If + thì quá khứ đơn],  [would + động từ nguyên mẫu]
• Câu điều kiện loại 3:  [If + thì quá khứ hoàn thành],  [would + have + V3/V-ed]
• Câu điều kiện loại 0:   [If + S + V(s,es)], [S+ V(s,es)/câu mệnh lệnh]