小编为备考的同学们整理了大学英语六级口语关键句，希望可以为大家带来帮助，预祝大家高分通过大学，一起来学习一下吧。
　　口语关键句(24)
　　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.
　　点睛 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(意为说话人的症状现在未见好转)”。
　　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 all 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。
　　当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。