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Unit 10You’re supposed to shake hands.Grammar

be supposed to的用法小结 be supposed to do sth. 意为"应该做某事",其中...

be supposed to的用法小结

be supposed to do sth. 意为"应该做某事",其中to为不定式符号,后跟动词原形,可与should do sth.互换,两者多用于口语中。也可等同于ought to do sth.,但使用较少,多用于正式文体中。

  1. 当be supposed to的主语是人时,意思为"某人应该……",表示劝告、建议、义务、责任等,相当于情态动词should。

►Everyone is supposed to wear a seat belt in the car. 每个人在小汽车里都应该系安全带。

【典例】The students ought to wear school uniforms when they’re at school.

  1. are supposed to B. are allowed to              C. would like to               D. love to

【答案】A

  1. be supposed to的否定结构为be not supposed to,常用与口语中,意为"不准,不得,不应当"。

►She is not supposed to be angry about that. 她不应当为那件事而生气。

【典例】You are supposed to smoke here. (改为否定句)

You ________ ________ supposed to smoke here.

【答案】are not

  1. 当be supposed to 用于过去时时,常表示"某事本应该发生而没有发生"。

►He was supposed to arrive at six. But he was late. 他本应该6点钟到达,但是他迟到了。

  1. be supposed to后面接"have + 过去分词"时,表示"本应该做某事而没有做"。

►You are supposed to have handed in your homework. 你本应该把你的家庭作业交上来了。

  1. suppose, think, believe, guess等可以在特殊疑问句中作插入语。

►Who do you suppose will win the game? 你认为谁将会赢得这场比赛?

It + be + adj. + to do sth. 句型

  1. It + be + adj. + to do sth.意为"做某事是……的",it为形式主语,真正的主语是后面的动词不定式(短语)。因动词不定式(短语)作主语较长,而谓语部分相对较短,用it代替后就避免了"头重脚轻"的现象。

►I think it’s very important to sleep for eight hours a night. 我认为每晚睡8个小时是很重要的。

  1. 表示"对某人来说做某事是……的"用句型"It+ be + adj. + of sb. + to do sth."其中sb.为动词不定式to do sth. 的逻辑主语。二者的具体用法为:
It + be + adj. + for sb. + to do sth. 此句型中的形容词为描述事物特征的词,如difficult,important, easy, hard, necessary, possible, dangerous, impossible等,是说明动词不定式的。
It + be + adj.+ of + sb. + to do sth. 此句型中的形容词为描述人物品质及性格特征的词,如clever,foolish,good,kind,nice,polite等,用来说明of后的sb.。
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►It’s hard for me to answer your question. 对我来说回答你的问题很难。

►It was foolish of him to go alone. 他单独去太傻了。

【典例】—Let me help you carry the box, Granny.

—Thank you, Li Lei. It’s very nice ________ you ________ me.

  1. of; to help B. for; to help           C. of; helping            D. for; helping

【答案】A

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