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suppose和be supposed to do的用法
1．suppose的用法
意为“猜想；以为；假定”，但在具体的语言环境中意义不止于此。其用法如下：
(1)suppose＋that从句，表示“猜测……；假定……”。如：
①I suppose that you are right.
我猜你是对的。
②I suppose that she'll be there today.
我猜她今天将会在那里。
(2)suppose＋名词/代词＋to be...，表示“认为……是……”。如：
Many people suppose him to be over 50.
许多人认为他已经50多岁了。
(3)当suppose＋that引导的宾语从句变为否定句时，若主语是I或we，否定应前移，有此种用法的词还有think, believe, guess等。如：
①I suppose that she will come to your party.
→I don't suppose that she will come to your party.
②I suppose that he will agree with you.
→I don't suppose that he will agree with you.
(4)在表示同意或不同意别人的观点时，常用I suppose so./I don't suppose so.。如：
—Will he be back this weekend?
他这周末会回来吗？
—Yes, I suppose so./No, I don't suppose so.
是的，我想他会回来。/不，我想他不会回来。
2．be supposed to do的用法
(1)be supposed to...中的to是动词不定式符号，不是介词，故后面要跟动词原形。当be supposed to...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。如：
①We are supposed to wear a seatbelt in the car.
我们在汽车里都应该系安全带。
②We are supposed to wear school uniforms at school.
我们在学校应该穿校服。
(2)当be supposed to...的主语是“物”时，意为“本应；本该”，用于表示某事本应该发生而没有发生。如：
①The new laws are supposed to prevent crime.
这些新法令本应起到防止犯罪的作用。
②The train was supposed to arrive half an hour ago.
火车本应在半小时之前到达。
(3)be supposed to...的否定结构为be not supposed to...，它常用于口语中，意为“不被许可；不应当”。如：
①She was not supposed to be angry about that.
她本不该为那件事而生气的。
②You are not supposed to smoke in public.
你不应该在公共场所吸烟。
