=>

1. How do most of your classmates go to school?

-> how: như thế nào

2. How far is it from your house to school?

-> hỏi khoảng cách: how far is it from...to...?

3. What are the students learning in the schoolyard?
->what: gì, cái gì

4. When are there often traffic jams in the city centre?

-> when: khi nào

5. What did your father use to do?

-> used to V: đã từng/nghi vấn: did S use to V?

6. How does Trung usually ride his motorbike?

-> how: như thế nào