内容正文:
九年级英语下册(人教版)
Unit 10 You're supposed to shake hands.
第三课时 Section A(Grammar Focus4c)—单元同步语法精讲精练
eq \x(句型:be supposed to do sth.)
►概念:be supposed to do sth.意为“应该/应当做某事”,相当于should do sth.,用来表示根据规定或传统习惯人们不得不做或期待发生的事。be supposed to中的to为动词不定式符号,后接动词原形,be动词有人称和时态的变化。
►具体用法
①当be supposed to...的主语是“人”时,意为“应该……,被期望……”,可以用来表示劝告、建议、义务、责任等,相当于情态动词should。
eg:You're supposed to ask the teacher if you want to leave the classroom.如果你要离开教室的话,应该先问问老师。
►a bit意为“有点儿,一点儿”,相当于a little bit/a little。
eg:Your article is a bit long.你的文章长了一点儿。
【辨析】a little与a bit
①两者都可作状语,修饰比较级。
eg:He is a little/a bit older than you.他比你稍大一点儿。
②两者都可作主语或宾语。
eg:Please give me a bit/a little.请给我一点儿吧。
③两者前置修饰名词时,a little后可直接接名词,a bit必须加of后才能接名词。
eg:a little money=a bit of money一点儿钱
【注意】①not a little意为“很,非常”,相当于very (much)。
②not a bit意为“根本不,一点儿也不”,相当于not...at all。
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。
eg:The meeting is supposed to take place on Tuesday,
but we have to put it off.这个会议本应在星期二举行,但我们不得不把它推迟了。
The train was supposed to arrive half an hour ago.火车本应在半小时之前到达。
③be supposed to...还可用于表示“被认为……;被相信是……”。
eg:They are supposed to be very clever.他们被认为很聪明。
This house is supposed to be his.这所房子被认为是他的。
④be 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……”。
【注意】suppose作谓语时,后面的宾语从句如果是特殊疑问句,特殊疑问词应提到句首。这样的词还有think,believe等。
eg:Who do you suppose runs fastest?你认为谁跑得最快?
一、单项选择。
1.—Henry,you ____ tell the teacher if you need to leave the classroom.
—Sorry,sir.
A.are supposed to B.are surprised to
C.are afraid of D.are interested in
2.—John,you are ____ to tell your parents you will stay out late.
—Don't worry.I have already phoned my mother about it.
A.supposed B.afraid
C.willing D.excited
3.We are supposed ____ animals.They are our close friends.
A.protect B.to protect
C.protecting D.to be protected
A
A
B
二、按要求完成下列句子。
4.I suppose he will be back in half an hour.(改为否定句)
I ______ suppose he ____ be back in half an hour.
5.Parents should let their children know some good manners.(改为同