解放军文职考试：英语常用词汇-be supposed to

be supposed to

　　They are supposed to be here by now

　　词汇讲解:

　　被动语态在英语里使用频繁，通常表示主动含义，这与中国人的思维习惯相去甚远，考生须多加练习。这句话的意思是“他们现在应该到这儿了。”

　　考点归纳：

　　be supposed to的用法如下:

　　※ be supposed to的主语是sb.时，意为“应该;被期望”，可以用来表示劝告、建议、义务、责任等，相当于情态动词should。

　　如:Teachers are supposed to treat all the students alike.老师应该对所有的学生一视同仁。

　　※ 当be supposed to的主语是sth.时，意为“本应，本该”，用于表示“某事本应该发生而没有发生”。

　　如:The train was supposed to arrive an hour ago.火车本应在一小时之前到达。

　　※ 当be supposed to后接“have+过去分词”时，表示“本应该做某事而没做”。

　　如:Yau are supposed to have handed in your homework by now.现在你应该已经把作业交上来了。

　　※ be supposed to的否定结构为be got supposed to,用于口语中，意为“不被许可;不应当”。

　　如:She was not supposed to be angry about that.她本不该为那件事而生气的。