`1`. He doesn't attend the class regularly, so he can't understand the lessons.

`=>` If he attended the class regularly, he could understand the lessons.

Câu điều kiện loại 2: If + S + Ved + O, S + would/could/might + V.

`2`. Although she was a wealthy person, she wouldn't spare a pound on charity.

`=>` In spite of being a wealthy person, she wouldn't spare a pound on charity.

In spite of + Ving/N: mặc dù 

`3`. Why don't you buy a motorbike, Lam?" asked Tam

`=>` Tam suggested Lam should buy a motorbike.

S1 + suggest (that) + S2 + (should) + V: gợi ý ai (nên) làm gì

`4`. My head teacher has such a good sense of humour. He usually makes everyone laugh by telling funny stories.

`=>` My head teacher, who has such a good sense of humour, usually makes everyone laugh by telling funny stories.

`5`. Keep silent or the teacher will punish you.

`=>` Unless you keep silent, the teacher will punish you.

Unless = If not

1. If he attended the class regularly, he could understand the lessons.

- Câu điều kiện loại 2 diễn tả sự việc không thể xảy ra ở hiện tại:

              If + S + V(past), S + would/could... + V-inf.

2. In spite of being a wealthy person, she wouldn't share a pound on charity.

- In spite of/ Despite + NP/V-ing = Although + clause.

3. Tam suggested that Lam (should) buy a motorbike.

- suggest that sb (should) do sth: đề xuất, gợi ý ai (nên) làm gì.

4. My head teacher, who has such a good sense of humour, usually makes everyone laugh by telling funny stories.

- Mệnh đề quan hệ không xác định thường được ngăn với mệnh đề chính bởi dấu phẩy.

5. Unless you keep silent, the teacher will punish you.

- Unless = If not (Nếu không).

5.