be supposed todo的用法?
一. 当be supposed to的主语为“人”时,意为“应该/被期望……”,它用来表示建议、劝告、义务、责任等,相当于情态动词should。
例如:You are supposed to wear the safety belt in a car.坐车的时候你应该系安全带。
(该句的主语为“人”you,句子中的wear the safety belt“系安全带”为固定搭配。坐车系安全带是每个人必须遵守的责任,也属于别人对自己的建议和劝告。)
Our teachers are supposed to treat all the students alike.我们老师应该对学生一视同仁。
(该句的主语为our teachers“我们老师”为复数,且为“人”,“对所有学生一视同仁”属于的责任,所以此处主要理解为责任,也是老师应尽的义务)
2.当be supposed to的主语为“物”时,意为“本应该……”,用来表示某事本应发生而没有发生。
例如:The school bus is supposed to arrive fifteen minutes ago.校车本应该在15分钟前就到达的。
(该句中“火车本应在15分钟以前就达到”,暗示校车迟到了15分钟,可能现在还没有到。所以此处的be supposed to表达的是“本应该……而未能……”.)
The sports meeting is supported to take place on Monday.运动会本应在周一就举办的.
(本句暗含运动会由于其他原因未能如期在周一举办。take place“举办/发生”为固定搭配。)
3. was/were supposed to do sth相当于should have done sth意为“(过去)本应该做某事而(实际上)没做。”
例如:The school bus was supposed to arrive here at 7 o'clock.校车本应该7点到达。(可能作者现在已经到学校了,没有坐校车到校。在和同学交流的时候抱怨今天早上校车没有按时到达,所以用的是一般过去时。)
You should have arrived home.你应该是到家了的。
(冉老师有话说:该句为按照客观推测,“你”应该是已经到家了,可现实是还没有到家。)
4. be supposed to还可以用来表示“被认为是……/被相信是……”。
例如:You are supposed to be very brave.你被认为很勇敢。
(该句蕴含被动句,不清楚被动句的小伙伴可以查阅冉老师历史发文。被动句的主语为you,结构为are+supposed。主语是被别人认为很勇敢,并不是自己给自己的评价。)
5.be supposed to的否定形式为be not supposed to,常用于口语中,意为“不被认可……/不应当……。”
例如:You are not supposed to fight with others.你不应该和别人打架。
(此处的否定要放在be动词的后面,不能放在不定式的前面。“你不应该打架”,此处be not supposed to意为“不应该”。或者也可以理解为和别人打架这件事情,不被大家认可。)
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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