人教版九年级英语第十单元语法

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2020年12月17日15:18:38 1207字阅读4分1秒

supposebe supposed to do的用法

1suppose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。

2be 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。

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