be supposed to be supposed to什么意思

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大家好,小跳来为大家解答以上的问题。be supposed to什么意思，be supposed to这个很多人还不知道,现在让我们一起来看看吧！
1、be supposed to 的用法用法一： be supposed to... 其中to是动词不定式符号，不是介词，其后要跟动词原形。
2、当be supposedto... 的主语是“人” 时，意为“应该……”；“被期望……”，它可以用来表示劝告、建议、义务、责任等，相当于情态动词should 。
3、如：Everyone is supposed to wear a seat-belt in the car.每个人在汽车里都应该系安全带。
4、Teachers are supposed to treat all the students alike.老师应该对所有的学生一视同仁。
5、用法：当be supposed to... 的主语是“物”时，它表示“本应；本该”，用于表示“某事本应该发生而没有发生” 。
6、如：The new laws are supposed to prevent crime. 这些新法令本应该起到防止犯罪的作用。
7、The train was supposed to arrive half an hour ago. 火车本应在半小时之前到达。
8、用法三： be supposed to后面接“have + 过去分词”时，表示“本应该做某事而没做” 。
9、如：You are supposed to have handed in your homework by now.现在你应该已经把作业交上来了。
10、He is supposed to have arrived an hour ago. 他应该一小时前就到了。
11、用法四： be supposed to... 的否定结构为be not supposedto...,它常用于口语中，意为“不被许可；不应当” 。
12、如：She was not supposed to be angry about that. 她本不该为那件事而生气的。
13、You are not supposed to smoke on the bus. 你不应该在公共汽车上吸烟。
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