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1、第三课时第三课时Grammar Focus4c单元语法清单元语法清be supposed to do sth.中的中的to是动词不定式符号，其后要跟动词原形；是动词不定式符号，其后要跟动词原形；be随主语随主语的人称、数和时态的变化而变化。的人称、数和时态的变化而变化。(1)be supposed to do sth.意为意为“应该做某事应该做某事”，它可以表示劝告、建议、义务、责，它可以表示劝告、建议、义务、责任等，相当于情态动词任等，相当于情态动词should。Everyone is supposed to wear a seat belt in a car.每个人在坐车时都应该系安全带。
2、每个人在坐车时都应该系安全带。(2)其否定形式为：其否定形式为：be not supposed to do sth.，常用于口语中，意为，常用于口语中，意为“不被许可不被许可/不应该做某事不应该做某事”。You are not supposed to smoke on the bus.你不应该在公交车上抽烟。你不应该在公交车上抽烟。(3)其一般疑问句形式为：其一般疑问句形式为：Be主语主语supposed to do其他？其他？Was Lucy supposed to lock the door when she left the classroom?当露西离开教室当露西离开教室时，她应该锁门
3、吗？时，她应该锁门吗？(4)其特殊疑问句形式为：特殊疑问词其特殊疑问句形式为：特殊疑问词be主语主语supposed to do其他？其他？What are we supposed to do to save water in our daily life?在日常生活中，我们应在日常生活中，我们应该做什么来节约用水？该做什么来节约用水？(5)was/were supposed to do sth.相当于相当于should have done sth.表示过去本应该做某表示过去本应该做某事而并没有做。事而并没有做。The train was supposed to arrive half an
4、hour ago.火车本该在半小时之前到达。火车本该在半小时之前到达。【注意】表示根据规定或传统习惯，人们应该做某事的时候，【注意】表示根据规定或传统习惯，人们应该做某事的时候，be supposed to do和和be expected to do两者可以互换。但是两者可以互换。但是be expected to do比比be supposed to do的主观性的主观性更强。更强。She is expected to be a good doctor.她有望成为一名好医生。她有望成为一名好医生。“It isadj.to do sth.”为固定句型，其中为固定句型，其中it是形式主语，真正的主
5、语是动词不是形式主语，真正的主语是动词不定式定式(短语短语)。因为动词不定式。因为动词不定式(短语短语)作主语相对较长，为了避免头重脚轻，所以用作主语相对较长，为了避免头重脚轻，所以用it作形式主语。作形式主语。【拓展】【拓展】“It isadj.for sb.to do sth.”意为意为“对某人来说做某事是对某人来说做某事是的的”。此句型中。此句型中的形容词常用于表示事物的特征、特点，如的形容词常用于表示事物的特征、特点，如easy，hard，difficult，interesting，important，impossible等，用来说明后面的动词不定式。等，用来说明后面的动词不定式。It
6、s hard for me to answer your question.我很难回答你的问题。我很难回答你的问题。“It isadj.of sb.to do sth.”意为意为“做某事某人是做某事某人是的的”。此句型中的形容词。此句型中的形容词常用于表示人物的性格、品德，如常用于表示人物的性格、品德，如good，kind，nice，clever，polite等，用来说明等，用来说明of后的后的sb.。Its very kind of you to help me with my English.你帮助我学习英语真是太好了。你帮助我学习英语真是太好了。一、用括号内所给单词的适当形式填空。一、用
7、括号内所给单词的适当形式填空。1He was supposed _(come)to the meeting，but he didnt.2What were they supposed _(do)in the face of danger?3We are not expected _(arrive)late when we have a meeting.4Its convenient _(take)a bus to go to school.5It is good for people _(walk)after dinner.to cometo doto arriveto taketo walk
8、二、单项选择。二、单项选择。()6.Parents are _ to teach their children how to develop a good habit.A.invited BallowedCstopped Dsupposed()7.Students are not supposed _ loudly in the reading room.Aspeak BspeakingCto speak DspokeDC()8.If you are invited to dinner by Western friends，you will _ to stay and talk around
9、the table until the last dish is served.Aexpect BexpectedCbe expecting Dbe expected()9.Its difficult _ me to finish the math problems alone，so its kind _ you to help me.Aof；of Bfor；ofCof；for Dfor；forDB()10.It is wise _ Linda to make up her mind _ to play an instrument.Afor；learning Bfor；to learnCof；
10、learning Dof；to learnD三、根据汉语意思完成下列句子，词数不限。三、根据汉语意思完成下列句子，词数不限。11青少年应该帮助父母做家务。青少年应该帮助父母做家务。Teenagers are _ help their parents do housework.12人们不应该在这里抽烟。人们不应该在这里抽烟。People _ to smoke here.13(湖北十堰湖北十堰)对学生们来说，知道学习的重要性是必要的。对学生们来说，知道学习的重要性是必要的。Its necessary for students _ the importance of studying.14(湖北荆州
11、湖北荆州)在校期间，中国孩子多学一门语言是非常重要的。在校期间，中国孩子多学一门语言是非常重要的。For Chinese children，_ learn a second language in school.supposed/expected toare not supposedto knowits very important to一、根据句意及汉语提示填写单词。一、根据句意及汉语提示填写单词。1We walked along the _(海岸海岸)and enjoyed the sunset.2You must take your _(护照护照)if you want to trave
12、l abroad.3The boy stopped drawing on the _(黑板黑板)when the teacher came in.4Kuaiban is popular in _(北方的北方的)China，including Beijing and Tianjin.coastpassport(s)blackboardnorthern5(四川达州四川达州)It is bad m_ to talk with your mouth full.6(四川宜四川宜宾宾)Spring is my favorite s_ because different kinds of flowers c
13、ome out.anners eason二、用括号内所给单词的适当形式填空。二、用括号内所给单词的适当形式填空。7Shanghai is in the _(east)part of China.8Its useful for us _(learn)more about Chinese history.9All the visitors are required to check in before _(enter)the museum.10One of the good ways to love parents is _(keep)in touch with them.11Could you
14、help me get some _(chalk)to write on the notice board?12(辽宁盘锦辽宁盘锦)I hope this excellent report will be _(help)in answering your question.easternto learnenteringto keepchalk(s)helpful三、根据三、根据汉语汉语意思完成下列句子。意思完成下列句子。13(湖北孝感、黄湖北孝感、黄冈冈、咸宁改、咸宁改编编)与人握手与人握手时时脱下手套是礼貌的。脱下手套是礼貌的。It is polite _ your gloves when
15、you shake hands with others.14有人在敲有人在敲门门。我去看看是。我去看看是谁谁。Someone is _ the door.Ill go and see who it is.15电电影影长长安三万里安三万里很有教育意很有教育意义义，值值得一看。得一看。The film Chang An is very educational.It is _16桌子上有一些桌子上有一些脏东脏东西，西，请请把它把它们们擦掉。擦掉。There are some dirty things on the table.Please _to take offknocking at/onworth watching/seeingclean them off
