Cứu thi với mai kiểm tra rồi ;-;

=>

3. Tam's friend asked him how long he would stay in England.

4. Tam asked Lien how many oranges there were in the fridge.

5. The teacher asked Lien what her hobby was.

6. His friend asked him how he went to the airport.

7. Lan asked Mai how much that dress cost.

8. Ba asked Tam how often she washed her clothes.

9. Phong asked Thu when her father would leave Vietnam for USA.

10. The librarian asked my teacher how many books the students needed.

Câu tường thuật dạng WH questions: asked sb + từ để hỏi + S V(lùi thì)

Lùi thì trong câu tường thuật:
HTĐ (S Vs/es) -> QKĐ (S V2/ed)

Will -> Would