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题目
be supposed to do sth 与 be supposed to have done sth的区别
请讲清楚,并附上例句.

提问时间:2020-10-19

答案
1.be supposed to do= should do 应该做某事:
you are supposed to go to school on time=you should go to school on time.
你应该按时上学.
2.be supposed to have done sth= should have done.应该做成了某事(实际上没做成):
You are supposed to have done your homework= you should have done your homework.
你本应该能完成作业的.
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