`1`. Although he works hard, he can't support his family.

`->` Although + S + V `=` Despite + N/Ving: mặc dù

`2`. That old house has just been sold.

`->` Câu bị động hiện tại hoàn thành: S + has/have + been + Vpp

`3`. If he doesn't take these pills, he won't be better.

`->` Unless `=` If ... not, If 1: If + S1 + Vs/es, S2 + will + Vinf

`4`. He asked me how much I thought it would cost.

`->` Câu trần thuật có từ để hỏi: S + asked + me + từ để hỏi + V lùi thì

`5`. It is very interesting to go swimming in the pool in summer.

`->` It + be + adj + to V

1. Although he works very hard, he can't support his large family.

2. That old house has just been sold by them.

3. If he doesn't take these pills, he won't be better.

4. He asked me how much i thought it would cost.

5. It is very interesting to go swimming in the pool in summer.