考点透视与解读
【目标导航】
情态动词本身有一定的意义，但它们没有人称和数的变化，不能单独使用，须和动词一起构成句子的谓语，表示说话者的情感、态度和语气。情态动词后面跟动词原形。我们应该重点一些常见情态动词的用法，如can,may,must等。其中must表示肯定猜测、can’t表示否定猜测、may表示可能性是中考考查的重点。
【名师讲堂】
情态动词can
（1） 表示“能力、技能、功能”等”,可以和be able to转换。例如：
He can play the guitar very well.
＝ He is able to play the guitar very well.他吉他弹的很好。
She could speak French well when she was in college.
=She was able to speak French well when she was in college.在上大学时，她会讲法语。
【注意】
Can表示能力的时候，虽然可以和be able to转换，但can只有一般式和过去式两种时态，而be able to可以用于各种时态。
（2）表示“允许、请求、要求、建议”等。例如：
You can tell him the news.你可以告诉他那个消息。
Can I open the door for you ?我可以替你开门吗？
（3）用 could代替can ，表示语气的婉转。例如：
Could you help me clean the room? 你能帮我打扫房间吗？
Could you go to the movie with me?你可以和我一起去看电影吗？
（4）表示怀疑、猜测，常用于否定句和一般疑问句中。如：
He can’t be an English teacher.He knows little English.他不可能是老师，他几乎不懂英语。
She is so young ,can she be your mother?她如此年轻，会是你妈妈吗？
情态动词may
（1） 作“可以”解，用来表示请求或许可．如：
May I borrow your eraser? 我可以借你的橡皮吗？
You may ride a bike to school .你可以骑自行车去上学。
（2）作“可能”解，用来表示猜测，但语气不如must强烈，多用于肯定句。
I don’t know the way to the train station.Jack may know.我不认识去火车站的路。杰克可能知道。
Mr Wang may be at home.王先生可能在家里。
【注意】
① 辨析maybe和 may be
maybe 是副词，意为“也许”，通常用于句首．may be 的实质是情态动词may后面碰巧跟上动词原形be ,意为“可能是”，用作表语，通常用于句中．请比较：
Maybe his father is a policeman.
＝His father may be a policeman.他爸爸可能是个警察。
②might是may的过去式，might本身也是一个情态动词，用于现在时中表示可能性比较小。如：
一Whose guitar is this? 一这个吉他是谁的？
一It might belong to Alice.She plays the guitar. 一可能是艾丽丝的，她弹吉他。
情态动词must
（1）作“必须”解,表示义务、命令、或要求，其否定形式 “mustn’t”，意为 “禁止、不允许”，语气较为强烈。如： You must be careful next time.下次你一定要小心。
You mustn’t talk loudly in the classroom.你不允许在教室里大声说话。
【注意】
①在以must构成的一般疑问句中，其否定回答多用needn’t或don’t have to,表示“不必要”。如：
──Must I go there with you ? ──我必须和你一道去那儿吗？
──No ,you needn’t. ──不，你没必要。
②辨析must和have to
have to 表示“不得不、必须”，侧重于“客观条件”，有过去式had to 和其他时态;must表示个人意志和主观上的要求和看法，没有过去式。请比较：
I have to go to bed now ,for my mother asks me to do so. 我必须得睡觉了，因为妈妈要我睡觉。
I must go to bed now because I am very tired now.我必须要睡觉了，因为我很累了。
（2）用来表示肯定的猜测，意为 “一定，肯定”。如：
The man over there must be my uncle. 那边的那个人肯定是我叔叔。
You must be hungry.你肯定饿了。
【注意】
如果表示否定的猜测用can’t．例：
Mr Li can’t be an English teacher.He knows nothing about it.李先生不可能是英语老师。他一点都不懂英语。
The man can’t be my father.He has gone to England.那个人不可能是我爸爸，他已经去英国了。
情态动词need
need 既可以用作情态动词，又可以用作实义动词。用作情态动词时，后面跟动词原形，只用于否定句和疑问句。用作实义动词时，它有动词的全部形式，即现在时单数第三人称needs，现在分词以及过去式和过去分词needed，后面跟带to的动词不定式。例：
You need not meet him unless you’d like to.除非你愿意，否则你不需要见他。
Need he bring some small gifts?他需要带些小礼物吗？
He needs to wear more clothes .他需要多穿点衣服。
You don’t need to wait for him until 10 o’clock..你没必要等他到10点钟。
情态动词should
(1) 表示义务和职责。如：
We should save water.我们应该节约用水。
We should protect our envrionment.我们应该保护我们的环境。
（2）表示建议。如：
You should go and see a doctor.你应该去看看医生。
You shouldn’t talk to your parents like that.你不应该象那样和你父母说话。
（3）表示征求意见。如：
What should I do ?我该怎么办？
Should I help you with your English? 我可以帮你学英语吗？
能力训练
单项选择
1．—Look! It _____ be Jack on the playground.
—It _____ be him. Because I saw him enter the school library just now.
A. must, mustn’t B. can, can’t C. may, mustn’t D. must, can’t
2．—Let's go dancing tonight.
— Sorry, I _____. I have to go to a meeting.
A. can't B. mustn't C. may not D. needn't
3．—Whose guitar is this ?
—It ______Alice. She plays the guitar.
A. might be B. must be C. can belong D. might belong to
4．—Listen! Is that Kate playing the piano in the room?
—No. It be Kate. She has gone to London.
A.may not B.needn’t C.mustn’t D.can’t
5．—Must we collect the waste paper and bottles now?
—_________.You can do it after class.
A. Yes,you must B.No,you needn't
C. Yes,you may D,No,you mustn't
6．—That T-shirt with Yao Ming’s picture on it belong to David. He admires him a lot.
—No, it be his. He hates black color.
A.can,can’t B.may,needn’t C.must,mustn’t D.must,can’t
7．–Where is mom now?
—I’m not sure. She ______ be in the kitchen.
A. shall B. may C. need D. must
8．一May I play computer games, Mum?
一No. You wash your clothes first.
A.would B.can C.must D.will
9．—Must I finish my composition right now?
—No, you _________. You can hand it in tomorrow.
A. can’t B. mustn’t C. may not D. needn’t
10．—Shall we go swimming this afternoon?
—Sorry, I ________. I have lots of homework to do.
A. mustn’t B. needn’t C. may not D. can’t
11．─ Will you please stay here for the party ?
─ Sorry, I ___. I’ll have to go to an important meeting.
A. mustn’t B. needn’t C. can’t D. won’t
12. —Must I hand in my exercise book now, Mr Zhao?
—No, you . You may give it to me tomorrow.
A.needn’t B.mustn’t C.can’t D.may not
13．—Shall I tell Sally about it?
—No, you . I’ve told her already.
A.shouldn’t B.mustn’t C.needn’t D.can’t
14．— Can I tell my best friend about it?
— No, I don’t want anyone else to know it. You _______ keep it to yourself.
A. must B. need C. can D. may
15．— Must I park my car behind the building?
— No, you _____. You _____ park it here.
A. mustn’t; may B. may not; must C. don’t have to; may D. shouldn’t; must
16．You have already tried your best, so you ____worry about the matter.
A. can't B. needn't C. mustn't D. couldn't
17．—Must I finish that work today?
—No, you _____. You may finish it in three days.
A. mustn’t B. needn’t C. shouldn’t D. couldn’t
18．You __be tired after working for eight hours without a rest．
A．can B．may C．must D．need
19．When traffic lights are red，we ________ stop and wait.
A．may B．can C．must D．might
20．It`s nearly seven o`clock .Jack ____ be back home at this moment.
A.must B.need C. could D.can
21．—Are you going to Bejing by plane?
—It’s fast ,but expensive. So I am not sure.I____take a train.
A.should B.may C.must D.will
22．—Must I finish the work today, Mom?
—No, you ______. You can finish it tomorrow.
A. mustn’t B. can’t C. shouldn’t D. needn’t
23．Schools ______ allow students at least one hour a day for sports.
A. would B. might C. should D. could
24．–Whose notebook is this?
-It ________be Ning’s . It has her name on it.
A. need B. can’t C. must D. shall
25．— Could I go to the movie this weekend, Dad?
—Yes, you______. But you have to come back before nine.
A. shall B. must C. need D. can
26．Oh, dear! Did you walk such a long way on such a hot day? Sit down and have a drink.
You ______ be tired and thirsty.
A. can B. must C. may D. should
27．—May I swim in the lake,Dad?
—No,you________.Look!Here is a notice “No Swimming!”
A.may not B.mightn’t C.mustn’t D.needn’t
28.(2008•安徽) －Is Mr Brown driving here?
－I am not sure.He ________come by train.
A.may B.shall C.need D.must
29. (2008•南昌)If the traffic light is red,you _________cross the road.It’s very dangerous.
A.don’t B.mustn’t C.needn’t D.wouldn’t
30. (2008•恩施) －Let’s go to the concert tonight,Michael!
－Sorry,I_______.I have to help my mother with the housework.
A.mustn’t B.may not C.needn’t D.can’t
31. (2008•新疆) －Must I park my car in the garage?
－No,you________.You________park it over there,the parking lot.
A.mustn’t;may B.may not;must
C.don’t have to ;may D.shouldn’t ;must
32. (2008•重庆)－Who’s that boy reading in the garden?Is it David?
－It _______be David.I saw him in the classroom just now.
A.must B.can’t C.may D.shouldn’t
33. (2009•河南)－Excuse me,where are we gong to have our class meeting?
－I am not sure.Ask our monitor,please.He _______know.
A.can B.may C.need D.shall
34. (2009•安徽) －Who’s the man over there?Is it Mr Black?
－It_______be him.He’s much taller.
A.can’t B.mustn’t C.should D.may
35. (2009•江西) －Susan has bought a large house with a swimming pool.
－It________be very expensive.I never even dream about it.
A.must B.might C.can’t D.shouldn’t
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