Reported Speech :

HTĐ -> QKĐ

HTTD -> QKTD

TLĐ (will) -> TLĐ (would)

HTHT -> QKHT

QKĐ -> QKHT

Can -> Could

May -> Might

Will -> Would 

Must/Have to -> Had to

This -> That

These -> Those

Last -> The last, the earlier

Next -> The next, the following

Now -> Then 

Today -> That day

Tonight -> That night 

Tomorrow -> The following day

Yesterday -> The day before

Ago -> Before 

1. Lan said that she would go to Hanoi the following month.

2. They said that they were going to get married the following summer.

3. Nam said to Hoa that he had given her the letter 3 weeks before.

4. John said that he had to go then.

5. His father told him that he would give him a bicycle at his birthday party the following month.

6. Mary said that her father had taken her to the theater the night before.