Bài 1 :
1, might stay
2, cook
3, hasn't played
4, is ; will be
5, went
Bài 2 :
1. That car is more expensive than that one.
⇒ That one is cheaper than that car.
2. How long has Lan learnt English ?
⇒ How long did Lan learn English ?
3. We have eaten this food for a day.
⇒ We ate this food one day ago.
4. He has done his homework for 30'.
⇒ He did his homework 30' ago.
5. They have played this game for 30'.
⇒ They played this game 30' ago.
Bài 3 :
1. He / do / his homework / for an hour
→ He has done his homework for an hour.
2. We / go / camp / last summer
→ We went camp last summer.
3. Last month / his son / go / fishing
→ Last month his son went fishing.
Chúc cậu học tốt nhé!!! Vote cho tớ nha!!! Mơn trước ^^*