31. you/ have/ finished/ homework/ your/ yet?
=> Have you finished your homework yet ?
Thì hiện tại hoàn thành : Have/ has + S + V3?
32. vacation/ since/ we/ haven’t/ last/ had/ a/ year.
=> We haven't had a vacation since last year.
Thì hiện tại hoàn thành : S + has/ have + not + V3.
33. He was sick. He stayed at home. (because)
=> He stayed at home because he was sick.
Công thức : S + V + O + because + S + tobe + O.
34. It was very cold. They went swimming. (but)
=> It was very cold but they went swimming.
Công thức : S + + V + O + but + S + tobe + O.
35. We can go camping. We can go for a picnic. (or)
=> We can go camping or we can go for a picnic.
Công thức : : S + + V + O + or + S + tobe + O.
`Lunangoctrang1`