1. He said (that) he hadn't said anything at the meeting the week before.

- Thì quá khứ đơn -> Thì quá khứ hoàn thành

- last week -> the week before

- I -> He

2. She told me that letter had been opened.

- Bị động hiện tại hoàn thành -> Bị động quá khứ hoàn thành

- this -> that

3. Tom said in 50 year's time they would probably be living on Mars.

- will -> would

- we -> they

4. Mi said she hoped they would built a city out at sea.

- Thì hiện tại đơn -> Thì quá khứ đơn (hope -> hoped)

- will -> would

- I -> She

- We -> They

5. She told us her wish was to become a young inventor.

- my -> her

- Thì hiện tại đơn -> Thì quá khứ đơn (is -> was)

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- S + said + (that) + S + V (lùi thì)

- S + said to/ told + O + S + V (lùi thì)