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听力口语关键句21

　　21.You see,I still have this pain in my back;this medicine the doctor gave me was supposed to make me feel better by now.

　　六级词汇讲解:

　　被动语态表示主动含义的用法在英语里很常见，但却与我们中国人的思维习惯相去甚远，考生需多加练习。分号后句子的意思是医生给我开的药现在应该可以使我感觉好些了。

　　英语六级考点归纳

　　be supposed to的用法如下:

　　当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 ail students alike。

　　老师应该对所有学生一视同仁。

　　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:

　　You are supposed to have handed in your homework by now.

　　到现在你应该已经把作业交上来了。

　　be supposed to的否定结构为be not supposed to，常用于口语中，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。

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