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Unit 5 You’re supposed to shake hands.
Section A(Grammar Focus-4c)
语法专项突破
语法精讲
be supposed to 的用法
　　be supposed to do意为“应该做, 被期望做, 理应做”, 用来表示根据规定或传统习俗人们不得不做某事。时态、人称和句式的变化用be来体现, to为不定式符号, 后接动词原形。
1. —What are people supposed to do when they meet for the first time in the US
—______
A. They’re supposed to kiss each other.
B. They’re supposed to bow.
C. They’re supposed to shake hands.
D. They’re supposed to hug.
【解析】选C。考查风俗习惯。根据常识可知, 美国人第一次见面应该是握手。
2. Jane ______to call me last night, but she didn’t.
A. supposed　　　　　 B. supposes
C. was supposed D. is supposed
【解析】选C。考查固定搭配。由下文语境“但是她没有(打电话)”可知是“应该”, 应用be supposed to do sth. ; 其次根据句中的last night可知此处应用一般过去时的被动语态。
3. The students are supposed ______their homework on time.
A. finish B. to finish
C. finished D. finishing
【解析】选B。考查固定短语。be supposed to do sth. 应该做某事。
4. You are supposed to talk with them every week.
A. should　B. can　 C. have to　 D. may
【解析】选A。考查固定短语。be supposed to意为“应该”, 与should意思相近。
中考体验
1. (2022·绥化中考)You are supposed to ask your teacher for help.
你应该向你的老师求助/你应该找你的老师帮忙。
2. (2022·成都中考)—You are not supposed to enter(enter) the teacher’s office unless you are allowed to.
—Thanks, Mom. I got it.
3. (2022·青岛中考)To make rivers cleaner than before, everybody is supposed to protect(protect)them.
4. (2023·营口中考)青少年应该多与他们的父母沟通交流并被允许自己做决定。
Teenagers are supposed to/should communicate more with their parents and be allowed to make their own decisions.
考点二
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。[来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。
2. 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.。
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。
对点训练
1．（2023广州）—Was it necessary ________ John ________ some photos before helping the old man
—I think so. In this way, he could protect himself later.
A．of; taking B．for; taking C．of; to take D．for; to take
D【详解】句意：——对约翰而言，帮助老人之前，拍照是必要的吗？——我认为有必要。用这种方式，他帮过老人后能保护自己。
考查固定句式。本句为“It’s+adj.+for/of sb. to do sth.”是固定句式，当形容词说明不定式逻辑主语的性质、特征时，用of；说明不定式的性质时，用for。由necessary可知是说不定式的性质。故选D。
2.It’s necessary for us ________ to our parents when we have problems.
A．to talk B．talking C．talk D．talked
A【详解】句意：对我们来说，当我们遇到难题的时候，和我们的父母谈谈是很有必要的。
考查It的固定句型。It’s+adj.+for sb.+to do sth.意为“对某人来说，做某事是怎样的”，句中it是形式主语，真正的主语是其后的动词不定式，本题空处应填不定式，故选A。
3.It’s wrong ________ you ________ your parents’ advice.
A．for；don’t accept B．of；not to accept
C．for；not accept D．of；not accepting
B【详解】句意：你不接受你父母的建议是不对的。
考查动词不定式和介词。for对……来说；of……的，用于句型It’s+形容词+of sb. to do sth.中表示“某人做某事是怎么样的”；don’t accept不接受，谓语动词；not to accept不去接受，动词不定式的否定式；not accept不接受，位于情态动词后；not accepting不接受，动名词的否定式。It’s wrong of sb not to do sth.”意为“某人不做某事是错误的”。因此第一空应填介词of，第二空格应填not to accept。故选B。
4.—It is difficult ________ new faces in the new term.
—That’s why I suggest you let each student prepare a name card on the table. It’s the best way to help.
A．for me to remember B．of me to remember
C．for me remembering D．of me remembering
A【详解】句意：——在新学期里记住新面孔对我来说是困难的。——那就是为什么我建议你让每个学生在桌子上准备一张名片。这是最好的帮助方式。
考查固定句型。“It’s+形容词+for sb. to do sth.”意为“对于某人来说，做某事是……的”，句型中“it”为形式主语，句中动词不定式为真正的主语，形容词修饰事物；“It’s+形容词+of sb. to do sth.”意为“某人是……的去做某事”，句型中“it”为形式主语，句中动词不定式为真正的主语，形容词修饰人。句中形容词“difficult”修饰事物，应用介词for，故选A。
5.We find_____impossible for us______a foreign language well in a short time.
A．one ;learn B．it ;to learn C．that ;to learn D．this ;learning
B【分析】句意：我们认为对于我们来说短时间内学好一种外语是不可能的。
【详解】根据句型find it+形容词+for sb to do sth“认为对于某人来说，做某事是……”，此处it是形式宾语，to do sth是真正的宾语，故选B。

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