1. John said he could swim well but he didn't have enoughtime to swim

- can → could

- HTĐ → QKĐ

2. She asked me how I knew that

- S + askes + tân ngữ + Wh - q+ S + V(lùi thì)

3. My friend asked me if Caron had talked Kevin

- S + askes + tân ngữ + if+ S + V(lùi thì)

4. She said she wanted to buy a pocket calculator

- HTĐ → QKĐ

5. She said she had once spent a summer in this village

- QKĐ → QKHT

6. The nurse said Thr patient in that room hadn't obeyed doctor's orders

- this → that

- QKĐ → QKHT

`1`, John said he could swim well but he didn't have enough time to swim.

- Câu tường thuật với câu kể : S + said + (that) + S + V (lùi thì)

- I -> he

- can -> could

- Hiện tại đơn -> Quá khứ đơn

`2`, She asked me how I knew that.

- Câu tường thuật với câu hỏi : S + asked + (O) + Wh-word + S + V (lùi thì)

- you -> I

- Hiện tại đơn -> Quá khứ đơn

`3`, My friend asked me if Caron had talked to Kevin.

- Câu tường thuật với Yes/No-questions : S + asked + (O) + if/whether + S + V (lùi thì)

- Hiện tại hoàn thành -> Quá khứ hoàn thành

`4`, She said she wanted to buy a pocket calculator for her father.

- Hiện tại đơn -> Quá khứ đơn

- my -> her

`5`, She said she had once spent a summer in that village.

- Quá khứ đơn -> Quá khứ hoàn thành

- this -> that

`6`, The nurse said to doctor the patient in that room hadn't obeyed his orders.

- this -> that

- Quá khứ đơn -> quá khứ hoàn thành

- your -> his/her