=>

1. Motorbikes aren't exported by my countries.

-> bị động HTĐ: S is/am/are (not) V3/ed (by O)

2. He said (that) he would fix that radio.

-> câu tường thuật (lùi thì, will -> would/this -> that)

3. It is a water-fetching contest.

-> water-fetching contest ~ cuộc thi lấy nước

4. Mary asked Phuong if she knew My Son.

-> câu tường thuật dạng Yes/No questions: asked sb if S V(lùi thì, HTĐ -> QKĐ)

5. It is very difficult to answer the question.

-> it is (very) adj to V

1.Motorbikes aren't exported by my country 

- Câu bị động của thì Hiện Tại Đơn 

- Cấu trúc : S + is/am/are + Ved/V3 + ( by O ) 

- Motorbikes là số nhiều nên chia are

2.He said that he would fix this radio 

- Câu tường thuật

- S + said + (that) + S +V(lùi thì) ... 

- will -> would 

3.It is a water-fetching contest

- where = in/on/at which 

- Từ ghép : N + V-ing/V nguyên 

4.Mary asked Phuong if she knew My Son 

- Câu tường thuật dạng Yes/No Questions

- S + asked + sb + if/whether + S + V(lùi thì) + ... 

- you -> she (lùi đại từ) 

- HTĐ -> QKĐ 

5.It is very difficult to answer the question 

- It + be + adj + (for sb) + to V : như thế nào (cho ai) để làm gì

- To V + ... + be + adj + (for sb)