1. She asked me if I knew him.

2. Peter asked Lan if Phong Nha Cave was far from Hanoi.

3. Lan asked me where I had stayed the day before.

4. His friend asked him how often he went to the music festival.

5. He asked my mother what she would buy.

6. I asked Phong if he could sing.

7. She asked me if I had done my homework.

8. He asked me if my sister liked playing tennis with me.

1. She asked me if I knew him

2. Peter asked Lan if Phong Nha Cave was far from Hanoi

3. Lan asked me where I stayed the day before 

4. His friend asked him how often he went to the music festival

5. He asked my mother what she would buy

6. I asked Phong if he could sing

7. She asked me if I had done my homework yet

8. He asked me if my sister liked playing tennis with me

*Yes - No question: S + asked + (O) + if/ whether + S + V

*Wh - question: S asked + (O) + question word + S + V

*Lùi thì:

QKĐ → QKHT

HTĐ → QKĐ

HTHT → QKHT

HTTD → QKTD

QKTD → QKHTTD

will → would

can → could

may → might 

must → had to