?中考英語情態(tài)動(dòng)詞和虛擬語氣考點(diǎn)擊破
——50道精選試題訓(xùn)練
考點(diǎn)一、can/could的用法
1.表示能力,意為“能,會(huì)”。 could是can的過去式。
Jim can speak English, but he can't speek Chinese.
吉姆會(huì)說英語,但是他不會(huì)說漢語。
No one could answer this question
沒有人能回答這個(gè)問題。
注意
can與 be able to的區(qū)別
(1)can只用于一般現(xiàn)在時(shí)和一般過去時(shí)中，be able to可用于各種時(shí)態(tài)。
(2)在過去時(shí)態(tài)的句子中,could僅表示具備能力,不說明是否實(shí)施了能力;而 be able to側(cè)重有能力
且經(jīng)過努力而成功做成了某事。

2.表示推測(cè)意為“可能”常用于否定句和疑問句中。 could既可以表示過去的可能性,又可以表示現(xiàn)在的可能性,其語氣更弱一些。
That man can't be my English teacher. He has gone to
Canada.那個(gè)男子不可能是我的英語老師。他已經(jīng)去加拿大了。
He looks so young. He couldn 't be over fifty.
他看起來這么年輕,不可能50多歲了。
3表示請(qǐng)求或允許,多用于口語中。 could表示委婉的請(qǐng)求或看法,但是答語只能用can。
Can you bring your football to school?
你可以帶你的足球來學(xué)校嗎?
—Could you help me work out the problem？
你能幫我做出這道題嗎?
—Yes,Ican.是的,可以。
4.can還可表示理論上的可能性或一時(shí)的情況,常用于肯定句中,意為“有時(shí)會(huì)”。
The climate in the south can be pretty cold in winter.
南方的天氣在冬天有時(shí)也會(huì)很冷。
Jim can be very annoying吉姆有時(shí)會(huì)很煩人
5.can的習(xí)慣用法有:
can' t help doing sth.情不自禁做某事
can' t help but do sth.不得不做某事
can but do sth.只好做某事
can't...... too/enough無論怎么……也不為過
When I try to speak English, I cant help making many mistakes.當(dāng)我試圖開口說英語時(shí),我總是不由自主地犯許多錯(cuò)誤。
We can but wait until Mary comes.我們只好等到瑪麗來。
You can't be too careful to cross the road.過馬路時(shí),怎么小心也不為過。

考點(diǎn)二、may/ might的用法
1.表示把握性不大的推測(cè),意為“或許;大概”,可以對(duì)現(xiàn)在、過去或?qū)淼那闆r進(jìn)行推測(cè),常用于肯定句中。 might表示的可能性低于may。
We might go to Australia.我們可能去澳大利亞。
—Have you decided where to go for your summer vacation?
你們決定去哪里過暑假了嗎?
—Not yet. We may go to Qingdao. It is a good place for vacation.
還沒有。我們可能去青島。那是度假的好地方。
2.表示許可或征求對(duì)方的意見。給予許可時(shí)可用may,但不能用 might.
May I ask you to help us raise the money？
我可以讓你幫我們籌錢嗎?
Might I have a word with you?我可以和你談?wù)剢幔?br /> 3.may還可以用于祈使句中,表示祝愿。
May all your dreams come true.祝你夢(mèng)想成真。
May you have a pleasant journey.祝你旅途愉快。
注意
may be是“情態(tài)動(dòng)詞+系動(dòng)詞be"結(jié)構(gòu),意為“可能是”,否定式為 may not be。 maybe是副詞,意為“可能，大概”。

考點(diǎn)三、must的用法
1.mus表示義務(wù),意為“必須”,多指現(xiàn)在或?qū)淼那闆r,強(qiáng)調(diào)說話人的主觀意志。
It's getting late. I really must go.時(shí)間不早了。我真的必須走了。
We must be careful when were walking across the road.There' re too many cars now.我們過馬路時(shí)一定要當(dāng)心?，F(xiàn)在路上有很多汽車。
注意
haye to強(qiáng)調(diào)客觀的需要,意為“必須,不得不”;must表示說話人主觀上的看法,意為“必須”。 have to有人稱、數(shù)和時(shí)態(tài)的變化,而must只有一種形式。
I have to leave early tomorrow morning.
明天早上我必須要早點(diǎn)動(dòng)身。
You don 't have to tell him the truth
你沒有必要告訴他真相。

2.must表示推測(cè)時(shí),指有根據(jù)、有把握的推測(cè),只能用于肯定句?？梢詫?duì)現(xiàn)在、過去或?qū)淼那闆r進(jìn)行推測(cè)。
You must be a middle school student.
你一定是一名中學(xué)生。
Then you must be the person we are looking for.
那么你一定就是我們正在找的那個(gè)人了。
3.must的否定形式 mustn't意為“禁止,不許”,不能用來表示推測(cè)。表示否定推測(cè)時(shí)用can't,意為“不可能”。若表示“不必,沒必要”之意時(shí),應(yīng)該用needn't或don't have to。
You mustn' t do any cleaning on the first day of the Chinese New Year在中國(guó)新年的第一天你不許打掃任何東西。
You mustn't park your car on the busy street.
不許把車停在這條繁忙的街道上。
—Must I learn all these words by heart?
我必須要記住這些單詞嗎?
—No you needn 't. It'll be fine if you copy them in your exercise books.
不用，你在練習(xí)本上抄幾遍就可以了。
考點(diǎn)四、will/would的用法
1.表示意愿,可用于各種人稱。 would是will的過去式,用于過去的情況。
—Can someone help me?有人能幫我一下嗎?
—I will.我來幫你。
Mary said she would do everything for him.
瑪麗說她愿意為他做任何事情。
2.表示征求意見或提出請(qǐng)求,多用于第二人稱作主語的疑問句中。 would的語氣比較委婉。
Will you close the window? It s very cold
請(qǐng)你把窗戶關(guān)上好嗎?太冷了。
Would you help me with my English?
請(qǐng)你幫我學(xué)英語好嗎?
3.表示習(xí)慣或特性帶有主觀性,意為“總是”。will示現(xiàn)在的習(xí)慣, would表示過去的習(xí)慣。
In Canada, many people will not give big gifts to someone
lse.在加拿大,許多人不給其他人送大件的禮物。
He would go to the park as soon as he was free.
過去他一有空就去公園。
注意
used to和 would的用法區(qū)別
used to表示過去經(jīng)常性或習(xí)慣性的動(dòng)作或狀態(tài)且現(xiàn)在已經(jīng)結(jié)束,只能用于一般過去時(shí),含有較強(qiáng)的“今昔對(duì)比”的意味。 would通常表示過去經(jīng)常反復(fù)發(fā)生的習(xí)慣性動(dòng)作,不含有對(duì)比意味。
I used to study in a nearby primary school
我過去在附近的一所小學(xué)上學(xué)。
When he was a child, he would often go skiing.
小時(shí)候他經(jīng)常去滑雪。

考點(diǎn)五、$hall的用法
1.shall表示征求對(duì)方意見時(shí),主要用于第一、三人稱的疑問句中。
What time shall we leave in the morning?
我們?cè)缟鲜裁磿r(shí)候離開?
Shall Tom go there with me tomorrow
明天湯姆和我一起去那里嗎?
2.用于第二、三人稱作主語的陳述句中表示說話人給對(duì)方的許諾命令、警告等。
You shall have it back next week.
你下周一定要把它還回來。
No one shall bring phones in the exam.
考試中任何人不準(zhǔn)帶手機(jī)。
3.用于第三人稱作主語的陳述句中表示條約規(guī)定等中的義務(wù)或責(zé)任,意為“應(yīng)當(dāng),應(yīng)該”。
According to the contract, the work shall be finished on time.
按照合同規(guī)定,這項(xiàng)工作應(yīng)該按時(shí)完成。
All payments shall be made in cash.
所有款項(xiàng)都必須用現(xiàn)金支付。

考點(diǎn)六、 should的用法
1.表示義務(wù)、責(zé)任或勸告等,意為“應(yīng)該”,可用于各種人稱。
You should complete your test on time.
你應(yīng)該按時(shí)完成測(cè)試。
We should protect the environment.
我們應(yīng)該保護(hù)環(huán)境。
2.表示按照一定的根據(jù)進(jìn)行的推測(cè),常意為“按道理說應(yīng)該”。
He should be in my house now.
他現(xiàn)在應(yīng)該在我家里。
Dinner should be ready by now.
現(xiàn)在晚飯應(yīng)該做好了。
3.表示說話人的驚奇、憤怒、失望等特殊情感。
Can you imagine a smart man like him should make such a stupid mistake?
你能想象出像他這樣聰明的一個(gè)人竟然能犯如此愚蠢的錯(cuò)誤嗎?
How should I know it?我怎么會(huì)知道這件事?

考點(diǎn)七、need的用法
1.need作情態(tài)動(dòng)詞時(shí)無人稱和數(shù)的變化,后接動(dòng)詞原形,多用于否定句和疑問句中。
There's enough time for you to go to the airport. You needn't hurry up.
你有足夠的時(shí)間趕去機(jī)場(chǎng),沒有必要著急。
I needn't go to school today.我今天不必去上學(xué)。
2.由need引起的一般疑問句,肯定回答常用must或have to,否定回答常用 needn't.
—Need I answer the question?
我需要回答這個(gè)問題嗎?
-Yes, you must /Yes,you have to.
是的,你必須回答。/是的,你得回答。
No, you needn't.不,不必了
3.need作實(shí)義動(dòng)詞時(shí),主要用于肯定句中,有人稱和數(shù)的變化,后接帶to的不定式。其否定式和疑問式都要借助助動(dòng)詞do.
He needs some money to buy school things
他需要一些錢買學(xué)習(xí)用品。
You don 't need to do it yourself.
你不必親自做這件事情。

考點(diǎn)八、 had better的用法
1.had better表示最好……,用來表示勸告或建議,后接動(dòng)詞原形。
You look quite tired. You'd better stop to have a good rest.
你看起來相當(dāng)累。你最好停下來好好休息一下。
You' d better go to hospital at once.
你最好立即去醫(yī)院看病
2.其否定形式是將not直接放在 had better 的后面。
You had better not miss the last bus.
你最好不要錯(cuò)過末班車。

考點(diǎn)九、情態(tài)動(dòng)詞+have+過去分詞
1.“ might+have+過去分詞”表示對(duì)過去發(fā)生行為的推測(cè),把握性較小。意為“想必,也許,可能已經(jīng)”,否定形式含有“可能不會(huì)”之意。
The children might have arrived there by now.
孩子們現(xiàn)在可能已經(jīng)到達(dá)那兒了。
He might not have settled the problem
他可能尚未解決這個(gè)問題。
2.“ must+have+過去分詞”表示對(duì)過去或者已發(fā)生行為的肯定推測(cè),只用于肯定句中意為“一定,準(zhǔn)是”。
The students are playing on the playground now. They must have finished their homework
學(xué)生們正在操場(chǎng)上玩,他們一定是做完作業(yè)了。
The street is wet. It must have rained
街道是濕的,一定下雨了。
3.“can/ could+have+過去分詞”表示對(duì)過去發(fā)生行為的懷疑或不肯定只用于否定句和疑問句中。
They can't have finished the work that soon.
他們不可能那么快就做完工作了。
4.“ should+have+過去分詞”表示“過去該做而實(shí)際上沒有做的事,意為“本應(yīng)該”;其否定形式表示“不應(yīng)該發(fā)生卻發(fā)生了的行為”,意為“本不該"。
You should have come here earlier.
你本應(yīng)該早點(diǎn)來的。
You shouldn't have gone to see the film last night. You will take an exam this afternoon.
昨晚你本不該去看電影的,今天下午還要參加考試。
5.“ needn't+have+過去分詞”表示“過去本不必做而實(shí)際上已經(jīng)做了的事”。
We needn' t have waited for him.我們本不必等他的。
考點(diǎn)十、虛擬語氣
虛擬語氣表示說話人的某種愿望、假設(shè)懷疑、猜測(cè)和建議等,常用于純屬假設(shè)或?qū)崿F(xiàn)的可能性不大的情況。
情況
if從句
主句
與現(xiàn)在事實(shí)相反
動(dòng)詞過去式(be動(dòng)詞用were)
would/could/should/might+動(dòng)詞原形
與過去事實(shí)相反
had+過去分詞
would/could/should/might+have done
與將來事實(shí)相反
動(dòng)詞過去式should+動(dòng)詞原形; were to+動(dòng)詞原形
would/could/should/might+動(dòng)詞原形

1.表示與現(xiàn)在事實(shí)相反,if從句用一般過去時(shí),主句用 would/could/ should/ might+動(dòng)詞原形。
What would you do if you had a million dollars?
如果你有100萬美元,你會(huì)做什么?
2.表示與過去事實(shí)相反,從句用had+過去分詞,主句用would/could/ should/ might+have+過去分詞。
If it had been fine yesterday, we could have watched that air show.如果昨天天氣好的話,我們可能就去看那個(gè)航空展覽了。
3表示與將來事實(shí)相反,從句用一般過去時(shí)、“ were to+動(dòng)詞原形”或“ should+動(dòng)詞原形”,主句用woud/ could/should/ might+動(dòng)詞原形。
If it should snow tomorrow, they couldn't go out.
如果明天下雪,他們就不出去了。
【方法技巧】
1. —Must I finish my homework right now?
—No, you .
A. needn’t B. may not C. mustn' t D.can’t
解題技巧:A句意:“我必須現(xiàn)在完成我的家庭作業(yè)嗎?”“不,你不必?！币詍ust提問的一般疑問句,若表示“沒有必要”時(shí),用needn't或don' t have to回答;若表示“不可能”時(shí),用can’t回答。由本題句意可知選A項(xiàng)。mstn’t意為“禁止,不許”。
命題規(guī)律:解答有關(guān)情態(tài)動(dòng)詞的題目時(shí),首先要對(duì)勺意進(jìn)行正確理解,其次要牢記各個(gè)情態(tài)動(dòng)詞所表達(dá)的具體含義及其特殊用法。本題對(duì)以must開頭的一般疑問句的回答不是直接在must后面加not,而是要根據(jù)具體的句意來選擇用needn't還是can't進(jìn)行考查。
2.—Who's that man? Is it Mr Brown?
—That be mr Brown. He never walks that way.
A.can’t B. mustn' t C.must D. can
解題技巧:A句意:“那個(gè)人是誰?是布朗先生嗎?”“不可能是布朗先生。他從不那樣走路。”can't意為“不可能”,是對(duì)現(xiàn)有情況有根據(jù)的否定推測(cè),由“ He never walks that way”可知,本題選A項(xiàng)。
命題規(guī)律:can可以表達(dá)兩方面含義,一是側(cè)重能力的“可以;能夠”;一是表示推測(cè)的“可能”;其對(duì)應(yīng)的否定回答是can't“不能;不可能”,是對(duì)現(xiàn)有情況的有根據(jù)的否定推測(cè),而mustn't意為“禁止,不許”,不能用來表示推測(cè)。中考英語常將can't與must't混合一起進(jìn)行考查,考生要注意區(qū)分兩者之間的差別。
專項(xiàng)訓(xùn)練
1. —Must I water the flowers now, mum?
???????—No, you???????. You????????do it later.
A. mustn’t; must????B. mustn’t; may????C. needn’t; may????D. needn’t; must
?2.— _____ I know by what time you want the project to be done?
—By the day after tomorrow. _______ you finish it on time?
A. May; Can????B. Must; Need????C. Could; Must??????D. Need; Would
?3. —Who’s singing in the garden?
??????—It ______ be Mr. Brown. He always practices singing at this time.
?????A. must??????????????B. can’t??????????????C. need
?4.I ______ follow you. Would you please repeat it?
A. can’t?????????B. mustn’t???????C. needn’t????????D. shouldn’t
?5. —Must I hand in my homework now, Mr. Smith?
????????—No, you _______.
????????A. can’t?????????B. shouldn’t?????C. wouldn’t???????D. needn’t
?6. —Excuse me, may I keep the book a little longer?
???????—Sorry. You ________ return it today.
????????A. must??????B. mustn’t???????C. can?????????D. can’t
?7.—Is the man over there Mr. Brown?
?????—It ______ him. He has gone to??Brazil to watch the 2014 FIFA World Cup.
????????A. may not???????B. can’t be?????????C. shouldn’t???????D. mustn’t
?8.Children _______ sit in the front seat of a car. It’s too dangerous.
A. need???????B. needn’t???????C. must???????D. mustn’t
?9. —I forgot to bring my dictionary. Could I use yours?
???????—Yes, you ______.
A. can???????????B. must???????????C. could???????D. should
?10.The man is feeling much better now, so you ______ call a doctor.
A. needn’t????????B. can’t????????C. mustn’t??????D.??shouldn’t
?11.If you _____ smoke, please go outside .
???????A. can???????B. may???????????C. must?????????D. might
?12.After you read the article “Why fast food is slowly killing you”, you _____ stop
eating fast food.
A. can??????????B. may??????????C. have to???????D. should
?13.Look at the “No parking” sign. You _____park your car here.
A. should????????B. must????????????????C. needn’t???????D. mustn’t
?14.We ______ pay to get into the concert. It's free.
A. can’t?????????B. mustn’t??????C. might not?????D. don’t have to
?15.—May I take this magazine out of the reading room?
—No, you _______. You read it in here.
A. mightn’t???????B. won’t??????C. needn’t???????D. mustn’t
?16.—_______ you leave now? You only arrived here an hour ago.
—Sorry, but so much homework is waiting for me.
A. May??????????B. Must??????C. Can??????????D. Might
?17.—Must I go to law school and be a lawyer like you, dad?
???????—No, you _______, son. You’re free to make your own decision.
??????????A. can’t???????B. mustn’t???????C. shouldn’t???????D. needn’t
?18.Here is my phone number. You _______ call me anytime you like.
?????????A. must???????B. can??????????C. should?????????D. need
?19.—Let’s go climbing, shall we?
??????—You _______ be joking! Don’t you know I’m afraid of high places?
?????????A. may???????????B. can???????C. must??????????D. should
?20.—Are you interested in shopping online?
???????—Not so much. We _______ see real products but pictures.
???????A. shouldn’t???????B. can’t????????C. mustn’t????????D. needn’t
?21.—Could you please have a walk with me?
??????—Sorry, I _______. I have something important to do now.xkb1.com
????????A. mustn’t????????B. needn’t???????C. can’t??????????D. may not
?22.—Bob, where is Linda?
???????—She _______ be in the library, but I am not sure.
???????A. must??????????B. may?????????C. need??????????D. has to
?23.—Must we take out the trash now?
??????—_______. You can do it after class.
??????A. Yes, you must?????B. No, you can’t??
C. Yes, you may??????D. No, you needn’t
?24.—Lingling, can I use your e-dictionary?
??????—Sure. But you _______ return it after class.
????????A. must??????????B. can???????????C. may????????D. would
?25.—Look, someone left a book.
??—Oh, yeah… This book _______ be Kitty’s. Only she likes to read this kind of books.
????????A. can????????????B. must?????????C. may?????????D. might
?26.—Is the long-haired man Bruce?
?????—No, it _______ be him. He’s in New York now.
????????A. can’t???????????B. mustn’t??????C. needn’t?????????D. may not
?27.People _______ wait until the traffic becomes green. That’s the traffic rule.
???????A. must???????????B. can?????????C. need???????????D. may
28. -Is Lucy knocking at the door?
-No. It ________ be Lucy. She is in Japan now.
A. needn't???????B. must???????????C. can't
29.We hope that as many people as possible ________ join us for the charity show tomorrow.
A. need?????????B. can????????????C. must?????????????D. should
30. -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. -Our class won the English speaking contest.
-Congratulations! You _______ be very proud of it.
A. can??????????B. need???????????C. would???????????D. must
32.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
33.-The sports shoes must be Linda's.
-No, they ________ be. They're too small for her.
A. mustn't????????B. can't??????????C. may not??????????D. might not
?34.-I have spent too much time playing computer games these days.
-I think so. You _____ stop, for your study and your health.
A. will???????????B. must??????????C. can??????????????D. may
35.We ________ fight against pollution.
A. may???????????B. should?????????C. mustn't???????????D. needn't
36.We _______ careful when we are walking across the road. There are too many vehicles now.
A. can be??????????B. may be????????C. must be
37.-Is Mr. Brown driving here?
-I'm not sure. He _______ come by train.
A. may????????????B. shall??????????C. need?????????????D. must
38. -_________ you speak Japanese?
-No, I can't.
A. Can????????????B. Must??????????C. May?????????????D. Should
39. -Dad, must I finish my homework today?
-No, you ________. You may do it tomorrow.
A. needn't?????????B. mustn't????????C. don't?????????????D. won't
40.Thomas, please be quiet. The others _______ hear very well.
A. can't???????????B. mustn't????????C. shouldn't?????????D. needn't
41. -You mean this CD ________ belong to Victor?
-Yes, it has his name on it.
A. must???????????B. may??????????C. might????????????D. can
42.-I can't give up smoking, doctor.
-For your health, I'm afraid you ________.
A. may????????????B. can???????????C. have to???????????D. must
43.-Another cup of coffee?
-No, thanks. I _____ be off. Mary is waiting for me.
A. can???????????B. may????????????C. must????????????D. might
44. -I'm a little tired. Let's go to the zoo by taxi.
-We??????????take a taxi. It's not far from here.
A. can't????????????????B. mustn't???????????C. couldn't????????????????D. needn't
45. -Let's go to the West Hill Park by taxi.
-Oh, it is not far away from here. We _______take a taxi.
A. couldn't????????B. mustn't?????????C. needn't??????????D. can't
46.-Must I finish watering the flowers now?
-No, you________.
A. must??????????B. won't???????????C. needn't??????????D. can't
47. -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
48.It is usually warm in my hometown in March, but it _______ be rather cold sometimes.
A. must??????????B. can?????????????C. should???????????D. would
49. -Listen! Is Professor Johnson giving a report in the hall?
-No, it????????be him. He has gone to Japan.
A. needn't??????????B. may not???????????????C. mustn't???????????????D. can't
50. -Can you play the piano?
-Yes, I _______. I often practice it on weekends.
A. needn't???????B. need????????????C. can't?????????????D. can
參考答案
?1.【答案】C 2.【答案】A 3.【答案】A 4.【答案】A 5.【答案】D
6.【答案】A 7.【答案】B 8.【答案】D 9. 【答案】A 10.【答案】A
11.【答案】C 12.【答案】B 13.【答案】D 14.【答案】D 15.【答案】D
?16.【答案】B 17.【答案】?D 18.【答案】B 19.【答案】C 20.【答案】B
21.【答案】C 22.【答案】B 23.【答案】D 24.【答案】A 25.【答案】B
26.【答案】A 27.【答案】A
28.【解析】選C?？疾榍閼B(tài)動(dòng)詞can't表示推測(cè)的用法。can't表示否定的推測(cè)；must表示肯定的推測(cè)。由題意"不可能是露西，她現(xiàn)在在日本"可知應(yīng)選C。
29.【解析】選B?？疾榍閼B(tài)動(dòng)詞can的用法。as many people as possible can意為"盡可能多的人"。
30.【解析】選D?？疾榍閼B(tài)動(dòng)詞can't的用法。由答語"我必須幫助我的母親做家務(wù)"知"我不能去參加音樂會(huì)"，故選D。
31.【解析】選D
32.【解析】選B?？疾榍閼B(tài)動(dòng)詞mustn't的用法。mustn't意為"一定不能"，由"很危險(xiǎn)"可知用mustn't，故選B。
33.【解析】選B
34.【解析】選B?？疾榍閼B(tài)動(dòng)詞的must的用法。結(jié)合題中的關(guān)鍵信息"for your study and your health"可排除A、C、D三項(xiàng)，故正確答案為B。
35.【解析】選B?？疾榍閼B(tài)動(dòng)詞should的用法。由常識(shí)可知"我們應(yīng)該與污染作斗爭(zhēng)"，故選B。
36.【解析】選C
37.【解析】選A
38.【解析】選A
39.【解析】選A。對(duì)于以情態(tài)動(dòng)詞must提問的疑問句，否定回答要用"No,?主語+needn't"，故由問句中的must和答句中的No可選A。
40.【解析】選A
41.【解析】選B
42.【解析】選C?？疾榍閼B(tài)動(dòng)詞have to的用法。may意為"可能、或許"，can意為"能、會(huì)"，have to意為"必須、不得不"，表客觀要求，而must?表主觀愿望。根據(jù)題意"為了健康，你必須戒煙"可選C。
43.【解析】選C?？疾榍閼B(tài)動(dòng)詞must的用法。結(jié)合關(guān)鍵信息"Mary is waiting for me."可知題意為"我必須離開了"，故排除A、B、D三項(xiàng)，選C。
44.【解析】選D。四個(gè)選項(xiàng)都是情態(tài)動(dòng)詞的否定式，結(jié)合關(guān)鍵信息"It's not far from here."可知"我們不必乘出租車"，故排除A、B、C三項(xiàng)，選D。
45.【解析】選C
46.【解析】選C。考查對(duì)must開頭的一般疑問句的回答。以must開頭的一般疑問句，作否定回答時(shí)用情態(tài)動(dòng)詞needn't，故正確答案為C。
47.【解析】選A?？疾榍閼B(tài)動(dòng)詞must表示肯定的推測(cè)。結(jié)合關(guān)鍵信息"I never even dream about it."可知題意為"它肯定是非常貴的"，故排除B、C、D三項(xiàng)，選A。
48.【解析】選B
49.【解析】選D。本題考查can't表示否定的推測(cè)。四個(gè)選項(xiàng)都是情態(tài)動(dòng)詞的否定形式，分別意為"不能；不可能"、"千萬不能"、"應(yīng)該"、"可以；可能"。結(jié)合關(guān)鍵信息"He has gone to Japan."可知"他不可能是約翰教授"應(yīng)選D。
50.【解析】選D。以can?引導(dǎo)的一般疑問句再作肯定回答時(shí)還是用can。


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