1. He said that it wasn't a good idea.
2. They didn't tell me that they would visit Ha Long Bay.
3. The dentist told that his tooth needs filling.
4. Lien said that she might be absent from the meeting
1. He said that it isn’t a good idea.
--> He said that it wasn't a good idea.
2 They didn’t tell me that they will visit Ha Long Bay.
--> They didn't tell me that they would visit Ha Long Bay.
3. The dentist told that his tooth needed filling.
--> The dentist told that his tooth needs filling.
4. Lien said that she may be absent from the meeting.
--> Lien said that she might be absent from the meeting