`1`. Unless he works hard, he will not pass his exam.

`⇒` Cấu trúc: Unless = If not

`2`. If I had free time, I could go some where.

`⇒` Câu điều kiện loại 2: If + S + V (QKĐ), S + could/would + Vo

`3`. If I had much money now, I would buy a house in HN.

`⇒` Câu điều kiện loại 2: If + S + V (QKĐ), S + would + Vo

`4`. After David had gone home, we arrived.

`⇒` Cấu trúc: After + QKHT, QKĐ

`5`. After my mother had gone to work, I got up

`⇒` Cấu trúc: After + QKHT, QKĐ.

c2 : if i have free time , i'll go some where    \    c3 : if i have much money now, i'll buy the house in HN   mấy câu  sau mình chưa làm đc nên thông cảm mình chỉ giúp đc đên đây thôi