ai làm giúp em với ạ

`Đáp` `án:`

1. A (said → asked)

S + asked + O + if/whether +S + V (lùi thì)

2. C (could you → you could)

S + wanted to know + Wh + S+  V (lùi thì)

3. B (will go → would go)

will → would 

next Sunday → the next Sunday / the following Sunday 

4. B (did happen →  happened)

S + asked + O + WH + S+ V (lùi thì)

QKĐ → QKĐ / QKHT 

5. D (may stop → might stop)

S + said + that + S+ V (lùi thì)

may → might