1.You needn't have carried all those.........hết câu
2.John may work this weekend
3.I needn't have gone out after all
4.You shouldn't have left the windowns.......hết câu
5.It must have been Alison who made arrangment. I.....hết câu
cấu trúc trong bài S + have/ has + PII.
chúc bạn học tốt ạ