1、第三课时 Grammar Focus4c单元语法清be supposed to do sth.中的to是动词不定式符号，其后要跟动词原形；be随主语的人称、数和时态的变化而变化。(1)be supposed to do sth.意为“应该做某事”，它可以表示劝告、建议、义务、责任等，相当于情态动词should。Everyone is supposed to wear a seat belt in a car.每个人在坐车时都应该系安全带。(2)其否定形式为：be not supposed to do sth.，常用于口语中，意为“不被许可/不应该做某事”。You are not suppose
2、d to smoke on the bus.你不应该在公交车上抽烟。(3)其一般疑问句形式为：Be主语supposed to do其他？Was Lucy supposed to lock the door when she left the classroom?当露西离开教室时，她应该锁门吗？(4)其特殊疑问句形式为：特殊疑问词be主语supposed to do其他？What are we supposed to do to save water in our daily life?在日常生活中，我们应该做什么来节约用水？(5)was/were supposed to do sth.相当于s
3、hould have done sth.表示过去本应该做某事而并没有做。The train was supposed to arrive half an hour ago.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，be supposed to do和be expected to do两者可以互换。但是be expected to do比be supposed to do的主观性更强。She is expected to be a good doctor.她有望成为一名好医生。“It isadj.to do sth.”为固定句型，其中it是形式主语，真正的主
4、语是动词不定式(短语)。因为动词不定式(短语)作主语相对较长，为了避免头重脚轻，所以用it作形式主语。【拓展】“It isadj.for sb.to do sth.”意为“对某人来说做某事是的”。此句型中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。Its hard for me to answer your question.我很难回答你的问题。“It isadj.of sb.to do sth.”意为“做某事某人是的”。此句型中的形容词常用于表示人物的性格、品德，如
5、good，kind，nice，clever，polite等，用来说明of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。一、用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
6、_(take)a bus to go to school.5It is good for people _(walk)after dinner.to cometo doto arriveto taketo walk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 s
7、peak DspokeDC()8.If you are invited to dinner by Western friends，you will _ to stay and talk around 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；forD
8、B()10.It is wise _ Linda to make up her mind _ to play an instrument.Afor；learning Bfor；to learnCof；learning Dof；to learnD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。Teenagers are _ help their parents do housework.12人们不应该在这里抽烟。People _ to smoke here.13(湖北十堰)对学生们来说，知道学习的重要性是必要的。Its necessary for students _ th
9、e importance of studying.14(湖北荆州)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。1We walked along the _(海岸)and enjoyed the sunset.2You must take your _(护照)if you want to travel abroad.3The
10、boy stopped drawing on the _(黑板)when the teacher came in.4Kuaiban is popular in _(北方的)China，including Beijing and Tianjin.coastpassport(s)blackboardnorthern5(四川达州)It is bad m_ to talk with your mouth full.6(四川宜宾)Spring is my favorite s_ because different kinds of flowers come out.annerseason二、用括号内所给
11、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 help me get some _(chalk)to write on the notic
12、e board?12(辽宁盘锦)I hope this excellent report will be _(help)in answering your question.easternto learnenteringto keepchalk(s)helpful三、根据汉语意思完成下列句子。13(湖北孝感、黄冈、咸宁改编)与人握手时脱下手套是礼貌的。It is polite _ your gloves when you shake hands with others.14有人在敲门。我去看看是谁。Someone is _ the door.Ill go and see who it is.15电影长安三万里很有教育意义，值得一看。The film Chang An is very educational.It is _16桌子上有一些脏东西，请把它们擦掉。There are some dirty things on the table.Please _to take offknocking at/onworth watching/seeingclean them off
