be supposed to通常含有应该意思,表示一定的责任和义务。
You are supposed to know how to use a computer=You should know how to use a computer.
Students are not supposed to cook in their dormitory=Students shouldnt cook in their dormitory.
3)不定式的完成体:
I am sorry to have given you so much trouble.
Were leaving at five oclock in the morning,and hope to have done most of the journey by lunchtime.
②不定式完成进行体主要用于appear,seem,happen,pretend等之后,也可用于believe,know,report,say,understand等动词的被动式之后。
He appears to have been waiting for a long time.
He is believed to have been waiting for a message.
不定式的完成进行体与不定式的完成体略有不同,试比较:
He seems to have eaten the apples.
He seems to have been eating the apples.
③不定式的完成体还可以表达本该发生却未发生的事情常带这种不定式的谓语动词有:pretend,intend, appear,seem,should like,expect等。
I meant to have telephoned you,but I forgot.
4)不定式的语态:
①在不定式之前能找到不定式所表达的动作的执行者时,此不定式用主动态;反之则用被动态试比较:
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