1. how long would he stay -> how long he would stay ( vì đây không phải dạng câu hỏi, nó chỉ ở dạng trần thuật thôi nên không đảo trợ động từ " would" )

2. wants -> wanted ( đây là câu gián tiếp nên phải lùi thì từ Hiện tại -> Qúa khứ)

3. Hong if -> if Hong

4. told -> tells 

5. doesn't -> didn't ( vì câu gián tiếp nên phải lùi thì)

6. this question -> that question

7. bỏ " or not" ( chỉ có cấu trúc whether... or not chứ k có if... or not)

8. he'll come -> he would

9. must to write --> must write ( must + V)

10. asked me did not to -> asked me not to ( ask Sb not to do/ to do)

1, would he→he would

2, wants→wanted

3, Hong if →if Hong

4, work→worked

5, doesn't→didn't 

6, this→ that 

7, or not→∅

8, he'll come→he would

9, must to→must

10,  did not to -> not to