课件27张PPT。第三课时：Section A
(Grammar Focus-4c) It must belong to Carla.Unit 8 同学们，上一课学习的单词你们都掌握了吗？现在大家来检验一下，点击下面的音频开始听写吧！ 我们在Unit 7学习了含有情态动词的被动语态，
今天我们一起来学习情态动词的另一用法：用情态
动词may/might/could, must, can’t表推测。Grammar Focus I’m not sure... 我不确定……考向该句子主要用来表达对某事不太确定的一种交际用语。
eg：—Will your friend come by plane?
你的朋友要乘飞机来吗？
—I’m not sure.
我不确定。知识点1典例—Does the boy come from China?
—________.I know little about him.
A．I’m not sure B．Yes，he does
C．I know D．Thanks a lot A【点拨】 由答语中的第二句知，“我”对这个男孩不很了解，所以回答应表示否定意思，只有A项符合情景。 情态动词表示推测的用法 情态动词可以表示说话的语气，本单元我们主要学了must，might，could，can等情态动词表示推测的用法。表示推测时，要根据肯定句、疑问句或否定句的不同句式选用不同的情态动词。语法讲解拓展表示对现在情况的推测用“情态动词＋do”；表示对正在发生的事情的推测用“情态动词＋ be doing”；表示对过去或已完成事件的推测用“情态动词＋have done”。
eg：She might be in the classroom now.
她现在可能在教室里。
It’s ten o’clock. He must be having class.
十点钟了，他一定在上课。
She is crying. She must have known the bad news.
她在哭，她一定已经知道了这个坏消息。典例—Look! It ________ be David in the classroom.
—It ________ be him. Because I saw him in the library a moment ago. (广安)
A．may；mustn’t B．must；can't
C．can；can’t D．mustn’t；can
【点拨】句意：——看！一定是大卫在教室里。——不可能是他。因为刚才我在图书馆看到他了。表示肯定推测用must；表示否定推测用can’t。
B1．A：Where’s Jean?
B：I’m not sure. She ________(is/might be/must be) in the laboratory.
2．A：Everyone is going to the pool after school.
B：Really？It ________(must be/can’t be/could be) hot outdoors.Choose the best way to complete each sentence using the words in brackets.4a might bemust be3．A：That’s the phone.
B：Hmm. I wonder who it ________(must be/could be/should be)．
4．A：I wonder if these are Jim’s glasses.
B：They ________(can’t be/might be/could be) his. He doesn’t wear glasses.
5．A：I hear water running in the bathroom.
B：It ________(could be/must be/can’t be) Carla. She was thinking of taking a shower. could becan’t bemust be1．A：Many people are wearing coats.
B：The weather must be ________.
2．A：Sally has been coughing a lot.
B：She might be ________.
3．A：This restaurant is always very crowded.
B：The food _________________.
4．A：Whenever I try to read this book，I feel sleepy.
B：It can’t ______________.Complete these responses.4bcoldillmust be deliciousbe interesting sleepy /'sli?pi/ adj.瞌睡的；困倦的sleepy是由动词sleep加后缀“-y”构成的形容词。通过加后缀“-y”构成的形容词还有rainy，
windy，cloudy等。知识点2考向一eg：He stayed up late last night and feels sleepy today.
他昨晚熬夜了，今天他感到困倦【辨析】sleepy，asleep与sleeping考向二典例—Why are you looking________ in class all day?
—Because I can’t finish my homework until eleven every night. (连云港)
A．awake B．asleep
C．sleeping D．sleepy D【点拨】 本题用词义辨析法解题。句意：——你为什么整天在课堂上看起来困倦？——因为我每天晚上十一点才能完成作业。sleepy困倦的。 Look at this picture of a room. How much can you tell about the person who lives here？Is it a boy or a girl？What are his/her hobbies？Discuss your ideas with a partner.4cA：It could be a girl’s room because it’s very tidy.
B：I guess so. But it might be a boy’s room because the clothes look like boys’ clothes. 1．(威海)—Is that woman your head teacher?
—No, it ________ be her. Our head teacher is in her office.
A．mustn’t B．can’t C．needn’tB
【点拨】本题用语法判定法解题。must’t一定不要；can’t不可能；needn’t不必。根据后一句校长在她的办公室里可知，不可能是她。故选B。
一、单项选择2．(中考·长沙) —Who's singing in the garden?
—It ________ be Mr. Brown. He always practices singing at this time.
A．must
B．can't
C．need
【点拨】 must be 一定是，表示肯定的推测。
A3．(聊城)—Will Karen come to our party?
—She hasn’t decided yet. She ________ come.
A．need B．must
C．may D．has toC
【点拨】本题用语法判定法解题。need需要；must必须；may可能；have to不得不。由她还没有决定，说明她可能来。故选C。
4．—Where is Tom? I can’t find him.
—I’m not sure. He ________ books in the library now.
A．must read
B．must be reading
C．might read
D．might be readingD【点拨】由I’m not sure. 可排除A、B两项，再由now可知选D。5．(中考·杭州)If you ________ smoke, please go outside.
A．can B．may
C．must D．mightC【点拨】题干的意思是“如果你一定要抽烟，请到外面去。”二、按要求完成句子
6．The book must be Tom’s. (改为同义句)
The book ________ ________ ________ ________．
7．It might be a football. (用basketball改为选择疑问句)
________ it be a football _______ _______ __________？must belong to TomMightor a basketball 8．The man with glasses must be our English teacher.(改为否定推测)
The man with glasses ________ ________our English teacher.can’t be
【点拨】must be表示肯定推测，否定推测用can’t be表示。
9．Something must be wrong with my bike.(改为同义句)
________ must be __________ ______ with my bike.There
【点拨】考查“There must be＋不定代词＋形容词＋其他．”结构。
something wrong10．My wife is playing games with my son.(改为肯定推测)
My wife ________ ________ ________ games with my son. must be playing
【点拨】 “情态动词must＋be＋doing sth.”表示对正在发生的事情进行肯定推测，意为“一定正在做某事”。
本节课主要学习了用情态动词表推测的用法，了解了中考对这类题的考查角度，掌握了这类题的做题方法。课后作业A课后作业B1.熟记本课时的词汇
2.完成本课时的课后作业Unit 8 第3课时
一、单项选择
1．—Let's go climbing，shall we?
—You ________ be joking! Don't you know I'm afraid of high places？
A．must B．can C．may D．should
2．—Do you think that Kobe will be elected as the MVP this year?
—It ________ him.He has retired(退役) since April 14.
A．can't be B．mustn't be
C．must be D．can be
3．—Look! Xiaohong's pet bird finally flew back and ________ on the
highest branch in our yard.
—Really? She ________ be very happy to see it.
A．landed; must B．landed; may
C．landing; could D．landing; might
4．—Whose bike is this?
—I am not sure. It ________ be Mary's.
A．shall B．must C．might D．need
5．—Look, the lady in red ________ be our English teacher.
—No, she ________ be. She is in the office now.
A．must; can't B．can; mustn't
C．may; mustn't D．shall; can't
二、根据首字母或汉语提示完成句子
6．I didn't s________ well. I woke up several times during the night.
7．I'm ________ (确信的) that our dreams will come true through our
efforts.
8．I like reading, so I always spend my p________ money on books.
9．Firefighters wear special ________ (外套) and helmets when they
work.
10．Don't ________ ________ (追逐) each other in the ____________
(实验室)．
三、语法专练
11．这套装肯定是汤姆的。
The ________ ________ be Tom's.
12．天不可能正在下雨，因为阳光灿烂。
It ________ ________ ________ because the sun is shining.
13．现在他或许已经离开了，刚才他说要离开的。
He ________ ________ ________ now. He said he would leave just
now.
14．那栋房子不可能是布莱克先生的， 他没有足够的钱买它。
The house ________ ________ Mr. Black's. He doesn't have enough
money to buy it.
15．琳达一定在家，她说她会在家等我。
Linda ________ ________ at home. She said she would wait for me
at home.
答案
一、1.A 2.A 3.A
4．C 点拨：逻辑推理法。由前句“I am not sure.”可知不确定；might意为“也许”，表示可能性，符合句意。 5.A
二、6.sleep 7.sure 8.pocket 9.coats
10．run after; laboratory
三、11.suit must 12.can't be raining 13.might have left 14.can't be 15.must be
Unit 8第3课时
Ⅰ.根据句意，选择合适的单词填空。
1．You ________(can/must) be tired after working for a long time without
a rest.
2．—Who is the woman over there? Is she Mrs.Smith?
—It ________(may/can't) be her.She is much shorter.
3．—Where's Yuan Bao?
—I'm not sure.He ________(could/ should) be in the bedroom.
4．—What will the weather be like tomorrow?
—It________(must/might) be windy or rainy.I'm not sure.
5．Alice ________(must/can't) be working now, because the light in her room is still on.
Ⅱ.单项选择。
6．—I wonder if this smart phone is Mary's.
—It ______ belong to her.______ is totally different from this one.
A．mustn't; Her B．can't; Her
C．can't; Hers D．may; Hers
7．—Why are you looking ______in class all day?
—Because I can't finish my homework until eleven every night.
A．awake B．asleep C．sleeping D．sleepy
8．—Is that man Mr.Smith?
—It ______ be him.He has gone to New York on business.
A．may not B．needn't C．can't D．mustn't
9．—Listen! I think it______ be Mr.White singing in the office.
—No.It ______be him.He's in New York now.
A．must; mustn't B．may; mustn't
C．must; can't D．can; can
10．The iPad isn't ______.It belongs to______.
A．he; me B．hers; mine
C．his; me D．her; mine
Ⅲ.按要求完成下列句子。
11．The beautiful coat is Mike's sister's．(对画线部分提问)
________ ________ the beautiful coat?
12．The English book must be Sally's.(改为同义句)
The English book must ________ ________ Sally.
13．Whenever I get the news, I will tell you.(改为同义句)
________ ________ ________ I get the news, I will tell you.
14．Whose computer is this？(改为同义句)
Who ________this computer ________ ________？
15．It could be Lily's．(对画线部分提问)
________ ________ it be?
Ⅳ.用must, might, can, could或can't完成下列对话。
A: Tina, you look worried.What's wrong?
B: I can't find my English book.Where (16)________ it be? I (17)________ have lost it.
A: Don't worry.Let's see where it (18)________ be.
B: I think I (19)________ leave it in the reading room.But it isn't there.
A: What does your book look like? Let's look for it together.
B: It's blue.
A: Oh, look! Is this one yours?
B: No.It (20)________ be mine.Tom's name is on it.
A：I'm afraid you have to buy a new one.
答案
Ⅰ、1.must 2.can't 3.could 4.might 5.must
Ⅱ、6.C 7.D 8.C 9.C
10．C 点拨：be sb.'s＝belong to sb.。
Ⅲ、11.Whose is 12.belong to 13.No matter when
14．does；belong to 15.Whose could
Ⅳ、16.can/could 17.must 18.could/might
19．could/might 20.can't
