1. Lan told him not to forget to post the letter

2. Nam said he would visit Hoi An the follwing day

3. The customs officer told me open my bag

4 Johnny told Mary 

5. She told She She told she not  take you to Ha Long Bay

6. Ba asked Hoa if she liked this place

7. The man told Mai Where her father stayed after school

8. The teacher asked Nga if she was Ha Long Bay a place of interest in china

=>

1. Lan told him not to forget to post the letter.

2. Nam said that he would visit Hoi An the following day.

3. The customs officer asked me to open my bag.

4. Johnny asked Mary if she had finished her test.

5. She said that she didn't take me to Ha Long Bay.

6. Ba asked Hoa if she liked that place.

7. The man asked Mai where her father stayed after school.

8. The teacher asked Nga if Ha Long Bay was a place of interest in China.

S + told / asked O to V : câu mệnh lệnh, yêu cầu 

S+asked/wanted to know/wondered+if/wether+S+V ( lùi thì)  -> câu gián tiếp với dạng Yes No question.

S + asked(+O)/wanted to know/wondered + Wh-words + S + V ( lùi thì)  -> Wh-question