高一情態動詞練習題的內容

高一情態動詞練習題的內容

  篇一:【高一】情態動詞練習

  高中英語必修三 第一單元 情態動詞練習

  1.-________ I download the article again?

  -No,you needn't.

  A. ShallB. Will C. Must D. Can

  2. -Can you go skating with us this afternoon?

  -Sorry,I can't. I ________ take care of my little sister at home.

  A. canB. may C. would D. have to

  3. -Must I hand in my exercise book today?

  -No, you ________.

  A. can't B. needn't C. mustn't D. won't

  4. -________I have your English name, please?

  -Yes, Helen. H-E-L-E-N.

  A. Must B. May C. WillD. Need

  5. -Who is the boy over there? Is it John?

  -No, it ________ be him. John is much taller.

  A. mustn'tB. may not C. can'tD. needn't

  6. -Can you play the piano, Jay?

  -Yes, I ________. It's easy.

  A. must B. can C. needD. may

  7.-You must come back every month.

  -Yes, I ________.

  A. will B. mustC. shouldD. can

  8. - Must we clean the room right now?

  - No, you___. You ____ clean it after lunch.

  A. needn't;may B. needn't;must

  C. Mustn't;can D. mustn't;may

  9. Children ________ play with fire.

  A. mustn't B. can'tC. shouldn't D. needn't

  10. -________ I come in, Mr Green?

  -Yes,come in, please.

  A. MustB. Need C. WillD. May

  11. -Must I finish the work today?

  -No, you ________. You ________ finish it tomorrow.

  A. mustn't; may B. can't; can

  C. needn't; may D. needn't; must

  「答案與解析」

  1. C.這組對話的意思是:"我必須再次下載這篇文章嗎?""不必了。"該題測試情態動詞的用法。根據答語 No, you needn't 就能確定要選C.

  2. D.這組對話的意思是:"今天下午你能同我們一塊去溜冰嗎?""抱歉,我不能去。我必須在家照看我小妹妹。"該題測試情態動詞的用法。表示客觀上"不得不"做某事時,要用have to.

  3. B.這組對話的意思是:"我必須今天交作業嗎?""不必。"該題測試情態動詞的用法。對以must開頭的問句進行否定回答時,要用needn't.

  4. B.這組對話的意思是:"我可以知道您的英文名字嗎""可以,海倫。H-E-L-E-N."該題測試情態動詞的用法。"請求對方許可"時,常用 May I (we)…。

  5. C.這組對話的意思是:"那邊的那個男生是誰?是約翰嗎?""那不可能是他,約翰個子高些。"該題測試情態動詞的用法。表示很肯定的否定推測時,用can't.

  6. B.這組對話的意思是:"傑伊,你會彈鋼琴嗎?""會,小菜一碟。"該題測試情態動詞的用法。一般說來,以情態動詞can開頭的問句,肯定回答用can;否定回答用can't.

  7. A.此題易誤選為B或C.這是因為受了思維定勢的影響引起的,因為前面句子中的must這個詞,許多人就想當然地選擇了B項。其實,這裡應該選擇A項,句意為:"你必須每月回來一次。""好的,我會的。"

  8. A.needn't表示"沒有必要";may意為"可以".

  9. A.考查情態動詞。mustn't千萬不,絕不能,一定不要;can't不能;shouldn't不應該;needn't不必要。

  10. D.考查情態動詞。請求允許用may或can.

  11. C.考查情態動詞。否定回答must,表示"不必"用needn't,排除A和B.又表示允許"可以",用may或can,所以A正確。若用must與前面needn't相矛盾。

  篇二:高一英語情態動詞專題訓練及答案

  高一英語情態動詞專題訓練

  概 說

  助動詞(auxiliary)主要有兩類:基本助動詞(primary auxiliary)和情態助動詞(modal auxiliary)。基本助動詞有三個:do, have和be;情態助動詞有十三個:may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to. 上述兩類助動詞的共同特徵是,在協助主動詞構成限定動詞片語時,具有作用詞的功能: 1) 構成否定式:

  He didn’t go and neither did she.

  The meeting might not start until 5 o?clock. 2) 構成疑問式或附加疑問式:

  Must you leave right now?

  You have been learning French for 5 years, haven’t you? 3) 構成修辭倒裝:

  Nowhere can he obtain any information about his sister. Hardly had he arrived when she started complaining. 4) 代替限定動詞片語:

  A: Who can solve this crossword puzzle? B: Tom can.

  A: Shall I write to him? B: Yes, do.

  情態助動詞的特徵

  基本助動詞與情態助動詞最主要的區別之一是,基本助動詞本身沒有詞義,而情態助動詞則有自己的詞義,能表示說話人對有關動作或狀態的看法,或表示主觀設想:

  What have you been doing since? (構成完成進行體,本身無詞義) I am afraid I must be going. (一定要)

  You may have read some account of the matter. (或許已經) 除此之外,情態助動詞還有如下詞法和句法特徵:

  1) 除ought和used以外,其他情態動詞後面只能接不帶to的不定式。如果我們把ought to

  和used to看做是固定片語的話,那麼,所有情態動詞無一例外地只能接不帶to的不定式:

  We used to grow beautiful roses.

  I asked if he would come and repair my television set.

  2) 情態助動詞在限定動詞片語總總是位居第一:

  They need not have been punished so severely.

  3) 情態助動詞用於第三人稱單數現在時的時候,沒有詞形變化,即其詞尾無-s形式:

  She dare not say what she thinks.

  4) 情態動詞沒有非限定形式,即沒有不定式、-ing分詞和-ed分詞形式:

  Still, she needn’t have run away.

  5) 情態助動詞的“時”的形式並不是時間區別的主要標誌。在不少場合,情態助動詞的現

  在時和過去時形式都可以表示現在、過去或將來時間:

  Would you mind very much if I ask you to do something?

  She told him he ought not to have done it.

  6) 情態助動詞之間是相互排斥的,即在一個限定動詞片語中只能出現一個情態助動詞,但

  有時卻可以與have和be基本助動詞連用:

  You should have washed the wound. Well, you shouldn’t be reading a novel.

  情態助動詞的意義和用法

  情態助動詞從最普通的意義上來說,是修飾分句意義的一種方式,它可以反映說話者對其表述是否真實和可能的程度作出判斷。但不同的情態助動詞本身所包含的意義和用法又不同,下面逐個分析。

  1) can和could的用法

  1. 表示能力或客觀可能性,還可以表示請求和允許。如:

  Can you finish this work tonight? Man cannot live without air.

  — Can I go now?— Yes, you can.

  注意:①could也可表示請求,預期委婉,主要用於疑問句,不可用於肯定句,答語應用can(即could不能用於現在時態的簡略答語中)。如:

  Could I come to see you tomorrow?

  Yes, you can. (否定答語可用No, I?m afraid not.) ②can表示能力時,還可用be able to代替。如: I?ll not be able to come this afternoon. 2. 表示驚異、懷疑、不相信的態度。(主要用在否定句、疑問句或驚歎句中)

  Can this be true?

  How can you be so careless! This cannot be done by him.

  3. “can(could) + have + 過去分詞”的疑問或否定形式表示對過去發生的行為懷疑或

  不肯定。如:

  He cannot have been to that town. Can he have got the book?

  2) may和might的用法

  1. 表示許可。

  表示請求、允許時,might比many的語氣更委婉一些,否定回答時要用mustn?t表示“不可以”、“禁止”、“阻止”之意。如: You may drive the car.

  — Might I use your pen?— No, you mustn’t.

  用May I ... 徵詢對方許可在文體上比較正式,在口氣上比較客氣。在日常口語中,用Can I ... 徵詢對方意見在現代口語中更為常見。 2. 用於祈使句中表示祝願。如:

  May you succeed!

  3. 表示推測、可能(疑問句不能用於此意)。

  He may be very busy now.

  4. “may(might) + have + 過去分詞”表示對過去發生的行為的推測。如:

  He may not have finished the work.

  3) must和have to的用法

  1. 表示必須、必要。如:

  You must come in time.

  回答must引出的問句時,如果是否定的回答,不能用mustn?t,而要用needn?t或don?t have to。

  — Must we hand in our exercise books today? — Yes, you must. (No, you don?t have to.)

  2. “must be + 表語”的結構表示推測,它的否定或疑問式用can代替must。 This must be your pen.

  3. “must + have + 過去分詞”的結構常用在肯定句中,表示對過去發生的行為的推測。

  它的否定或疑問式用can代替must。 He must have been to Shanghai. 4. have to的含義與must相似,兩者往往可以互換使用,但have to有各種形式,隨have

  的變化而定。must與have to有下列幾點不同:

  ① must表示的是說話人的主觀看法,而have to則往往強調客觀需要。如:

  The play is not interesting. I really must go now. I had to work when I was your age.

  ② must一般只表現在,have則有更多的時態形式。 ③ 二者的否定意義不大相同。如:

  You mustn’t go. 你可不要去。 You don’t have to go. 你不必去。 ④ 詢問對方的意願時應用must。如:

  Must I clean all the room?

  4) dare和need的用法

  1. need表示“需要”或“必須”,作情態動詞時,僅用於否定句或疑問句中,在肯定

  句中一般用must, have to, ought to,或should代替。如: You needn’t come so early.

  — Need I finish the work today? — Yes, you must.

  注意:needn?t + 不定式的完成式“表示本來不必做某事而實際上做了某事”。如: You needn’t have waited for me. 2. Dare作情態動詞時,主要用於疑問句、否定句和條件從句中,一般不用在肯定句中。

  如:

  How dare you say I?m unfair.

  He daren’t speak English before such a crowd, dare he?

  3. Dare和need常用作實義動詞,有時態、人稱和數的變化,所不同的是,作實義動

  詞時,在肯定句中,dare後面通常接帶to的不定式,在否定和疑問句中,dare後面可接帶to或不帶to的不定式。如: I dare to swim across this river. He does not dare (to) answer. Don?t you dare (to) touch it! I wondered he dare (to) say that. He needs to finish it this evening.

  5) shall和should的用法

  1. Shall用於第一人稱,表示徵求對方的意願。如:

  What shall we do this evening? 2. Shall用於第一、第三人稱疑問句中,表示說話人徵求對方的意見或向對方請示。如:

  Shall we begin our lesson?

  When shall he be able to leave the hospital?

  3. Shall用於第二、第三人稱,表示說話人給對方命令、警告、允諾或威脅。如:

  You shall fail if you don?t work harder. (警告)

  He shall have the book when I finish reading. (允諾) He shall be punished. (威脅)

  4. Should表示勸告、建議、命令,其同義詞是ought to;在疑問句中,通常用should

  代替ought to。如:

  You should go to class right away. Should I open the window?

  Should的含義較多,用法較活,現介紹三種其特殊用法。請看下面的句子: ① I should think it would be better to try it again. 我倒是認為最好再試一試。 ② You are mistaken, I should say. 依我看,你是搞錯了。 ③ I should advise you not to do that. 我倒是勸你別這樣做。

  ④ This is something I should have liked to ask you. 這是我本來想問你的。

  從以上例句可以看出:情態動詞should用於第一人稱時可以表示說話人的一種謙遜、客氣、委婉的語氣。

  Should還可以用在if引導的條件從句,表示一件事聽起來可能性很小,但也不是完

  全沒有可能。相當於“萬一”的意思。從句謂語由should加動詞原形構成,主句謂語卻不一定用虛擬語氣。如:

  ⑤ Ask her to ring me up if you should see her. 你萬一見到她,請讓她給我打個電話。 ⑥ If you should change your mind, please let us know. 萬一你改變主意,請通知我

  們。

  ⑦ Should I (If I should) be free tomorrow I will come. 萬一我明天有時間,我就來。 此外,Why(or How) + should結構表示說話人對某事不能理解,感到意外、驚異等意思。意為“竟會”。如:

  ⑧ Why should you be so late today? 你幾天怎麼來得這麼晚? ⑨ — Where is Betty living? — 貝蒂住在哪裡? — How should I know? — 我怎麼會知道呢?

  ⑩ I don?t know why you should think that I did it. 我真不知道你憑什麼認為這件事

  是我乾的。

  5. “should + have + 過去分詞”結構一般表示義務,表示應該做到而實際上沒有做到,

  幷包含一種埋怨、責備的口氣。如: She should have finished it.

  I should have helped her, but I never could. You should have started earlier.

  6) will和would的用法

  1. 表示請求、建議等,would比will委婉客氣。如:

  Would you pass me the book? 2. 表示意志、願望和決心。如:

  I will never do that again.

  They asked if we would do that again.

  3. 用“will be”和“will(would) + have + 過去分詞”的結構表示推測,主要用於第二、

  三人稱。前者表示對目前情況的推測,後者表示對已經完成的動作或事態的推測。如:

  This will be the book you want. He will have arrived by now.

  The guests would have arrived by that time. I thought you would have finished this by now. 4. Would可表示過去反覆發生的動作或某中傾向。Would表過去習慣時比used to正式,

  並沒有“現已無此習慣”的含義。如: The wound would not heal.

  During the vacation he would visit me every week. 5. 表料想或猜想。如:

  It would be about ten when he left home. What would she be doing there?

  I thought he would have told you all about it.

  7) ought to的用法

  1. Ought to表示應該。如:

  篇三:高一英語必修三 情態動詞(含習題及解析)

  情態動詞全解析

  一、何謂“情態動詞”?

  情態動詞主要用來表示說話人的情感、態度等,是中學英語語法的重點,也是高考的熱點,

  是單項填空必考的一個知識點。情態動詞在近五年高考中主要考查四點:情態動詞表示推測

  和可能性的用法;情態動詞與虛擬語氣;情態動詞的表達“情感、態度、語氣等”,情態動詞

  表示 “必要性”等方面的用法。

  二、情態動詞的特點

  1.沒有人稱和數的變化。

  2. 有些情態動詞有過去式的變化:

  e.g. will → would , can → could , may→ might , dare → dared

  三、情態動詞的否定形式

  情態動詞+ not +動詞原形can not: can't , must not: mustn't , need not : needn't

  四、情態動詞的用法及相互間的區別(注意:這是常考的考點)

  1. can , be able to be able to 表示經過努力後, 能夠做到; be able to 有多種形式的變化。

  can

  1). 表示體力或腦力方面的能力;

  2). 表示允許、可能性。

  could 是can的過去式, 表示過去有能力及過去存在的可能性 ; 用於疑問句表示委婉地提出

  問題。

  1) The fire spread through the hotel very quickly but everyone ____ get out.

  A. had to B. would C. couldD. was able to

  2) -Will you stay for lunch?

  -Sorry, __. My brother is coming to see me.

  A. I mustn'tB. I can't C. I needn't D. I won't

  2.may 表示詢問或說明一件事可不可做; 表示某事有可能發生。might是may的過去式; 用

  在疑問中比may委婉、客氣。

  1) -May I take this book out of the reading-room?

  -No, you mustn't.( Yes, you may.)

  2) -Might I make a suggestion? -Yes, you may.

  3. must

  1). 表示必須要做的事: 必須

  2) 表示很有把握的推斷: 一定, 準是。have (has)to : have (has)got to 必須, 不得不。過

  去式: had to

  3) -Must I get to the station before three o'clock?

  -Yes, you must. ( No, you needn't. )

  4) I'm afraid you will have to wait a while.

  5) She must be in the classroom now.

  6) Mary ____ be in Paris, I saw her in town only a few minutes ago.

  A. mustn't B. shouldn'tC. can'tD. may not

  4. shall

  1) 在疑問句中, 用於第一、三人稱表示說話人徵求對方的意見或向對方請求。

  2) 用於二、三人稱,表示說話人給對方的 命令、警告、允諾等概念。

  1) - Shall I place an order with you now? -No, you needn’t.

  -Shall he turn down the radio a bit? -

  Yes, please.(No, please don't.)

  2) You shall have the English book as soon as I finish it.

  3) Everything that he owns shall be taken away from him.

  4) Your brother seldom comes to see you, ____?

  A. does he B. doesn't he C. will he D. isn't he

  5) It's a fine day. Let's go fishing, ____?

  A. won't we B. will we

  C. don't we D. shall we

  5. should 應該 ; 應當

  1) You should listen to the doctor's advice.

  2) You should study the article carefully.

  6. will, would

  1) 在疑問句中用於第二人稱,表示說話人向對方提出請求或詢問。用would語氣更加婉轉。

  2) will 表示現在的習慣性動作或狀態; would 表示過去的習慣性動作或狀態。

  3) will 用於各種人稱, 表示 意志、意願、決心、允諾; would 表示過去時間的 意志、意願、......。

  (1) Don't smoke in the meeting room, ___ you?

  A. do youB. will youC. can you D. could you

  -Will you come with me?-Yes, I will.(I am sorry , I can't.)

  (2) -Would you tell us something about yourself? -Yes, I will.

  (3) - It's my birthday tomorrow. Don't forget to come to my party.

  - _____ .

  A. I don't B. I won't C. I can't D. I haven't

  7. ought to 應該; 應當

  1) You oughtn't to smoke too much.

  2) She ____ for what she has done.

  A. ought to praise B. ought be praised

  C. ought to have praised D. ought to be praised

  8. dare1. dare to come2. dare come

  1) He dare not tell the truth.

  2) He doesn't dare to come out at night.

  3) I don't know whether he ____ try.

  A. dare B. needs C. wants D. is allowed

  9. need

  1). 作為情態動詞:必須

  2). 作為實義動詞: 需要

  A.主語是人 need( to do something ; to be done by somebody)

  B. 主語是事物 need ( doing; to be done)

  1) -Do they need to take any books with them?

  -No, they don't need to.

  2) -Need we buy any new equipment? -No, we needn't.

  3) This farm tool needs repairing.

  This farm tool needs to be repaired.

  4) -Shall I tell John about it ?

  - No, you ___ . I've told him already.

  A. needn't B. wouldn't

  C. mustn'tD. shouldn't

  5) It's a fine day. You ____ take a raincoat with you.

  A. can't B. mustn't

  C. needn't D. may not

  [★★★]五、情態動詞的解題例析

  (1) 認真審題,結合所給出的語境,正確把握說話者的語氣、情感、態度、觀點等。

  (2) 認真思考所給選項中情態動詞的基本特徵和用法,並結合語境推敲答案。

  (3) 要注意把握時間概念。

  情態動詞無論是表達“推測和可能性”,還是表達“虛擬”這一概念,只要是對過去已經發生的

  事情進行描述,一律用“情態動詞+have done”這一結構;對現在或將來的事情進行描述,用“情

  態動詞+動詞或系動詞原形”。例如:

  (NMET2008山東,24)Thank you for all your hard work last week. I don’t think we ______ it

  without you.

  A. can manage B. could have managed

  C. could manage D. can have managed

  根據題幹中所給出的時間last week可知我們已經做完了工作,已經完成,故排除A、C兩

  項,再結合could have done表示虛擬語氣以及與前面的I don’t think…,故說話者想表達的

  意思是:離開了你,我們本不可能完成這項工作。故答案為B項。

  ★下面我們來看看常考的'一些情態動詞★

  以下試題均來源於往年的高考試題,具有很強的針對性

  (1) must表示推測,意為“一定……”,只能用於肯定句中。 must have done意為:一定做過

  某事或某事肯定發生了。 例如:

  —She looks very happy. She ______ have passed the exam.

  —I guess so. It’s not difficult after all.

  A. should B. could C. must D. might

  【解析】句意為:她看上去很高興,一定是通過了考試。

  【答案】C

  (2) should (not) / ought (not) to在中表示根據常規或常識推測,表示“某事應該或不應該發

  生”,語氣比must或can’t / couldn’t稍弱。

  例如:—How’s your tour around the North Lake? Is it beautiful?

  —It ________ be, but it is now heavily polluted.

  A. will B. would C. should D. must

  【解析】should此處表示推測,意為“應該”。

  【答案】C

  ②There _________ be any difficulty about passing the road test since you have practiced a lot in

  the driving school.

  A. mustn’t B. shan’t C. shouldn’t D. needn’t

  【解析】句意:既然你在駕校進行了大量訓練,那麼透過道路測試按理不應該有困難。

  【答案】C

  (3) can, could表達推測時,一般用於疑問句和否定句中;can用於肯定句中表示一種理論上

  的可能性,並不牽涉是否真的會發生,在這種用法中can只能與動詞原形連用;could用於

  肯定句中,語氣比may/ might更弱。例如:

  ①You ______ be hungry already — you had lunch only two hours ago!

  A. wouldn’t B. can’t C. mustn’t D. needn’t

  ②She ______ have left school, for her bike is still here.

  A. can’t B. wouldn’t C. shouldn’t D. needn’t

  ③It is usually warm in my hometown in March, but it _____ be rather cold sometime.

  A. must B. can C. should D. would

  ④Peter ____ be really difficult at times even though he’s a nice person in general.

  A. shall B. should C. can D. must

  【解析】①② 兩個考題中can用於中表示否定的推測,意為:不可能,一定不會; ③④兩個

  考題中can表示理論上的可能性,翻譯為:有時候會……。

  【答案】① B ② A ③ B ④ C

  (4)may (not) / might (not)表達一種不太把握的推測,意為“或許,可能”;might的語氣比may

  較婉轉。例如:

  ① Liza ___ well not want to go on the trip --- she hates traveling.

  A. will B. canC. mustD. may

  【解析】may well為固定搭配,意為:很可能,極有可能。

  【答案】D

  ② Although this ____ sound like a simple task, great care is needed.

  A. mustB. may C. shallD. should

  【解析】這聽起來或許是一項簡單的任務,但卻需要極大的細心。

  【答案】B

  ③—I can’t find my purse anywhere.

  —You __ have lost it while shopping.

  A. may B. can C. should D. would

  【解析】結合語境可知,回答者是在提醒對方:或許購物時把錢包丟了。

  【答案】A

  (二)表達虛擬語氣的情態動詞

  對過去的一種結果的假設或虛擬,用情態動詞+have done這一結構,常用的有以下幾個情態

  動詞:

  (1) should (not) / ought (not) to have done本(不)應該做某事,但卻沒有做或做了,含有責

  備或後悔之意。例如:

  —I’m sorry. I _________at you the other day.

  —Forget it. I was a bit out of control myself.

  A. shouldn’t shoutB. shouldn’t have shouted

  C. mustn’t shoutC. mustn’t have shouted

  【解析】對不起,我那天本不應該對你大喊大叫的。

  【答案】B

  (2) could have done本來能夠做某事但未做。例如:

  Thank you for all your hard work last week. I don’t think we ______ it without you.

  A. can manage B. could have managed

  C. could manage D. can have managed

  【解析】根據題幹中所給出的時間last week可知我們已經做完了工作,已經完成,故排除

  A、C兩項,再結合could have done表示虛擬語氣以及與前面的I don’t think…,故說話者想

  表達的意思是:離開了你,我們本不可能完成這項工作。

  【答案】B

  (3) needn’t have done本沒有必要做某事但卻做了。要注意needn’t do則表達“沒有必要去做

  某事”,時間上應該是現在或將來。例如:

  ①—Catherine, I have cleaned the room for you.

  —Thanks. You ________ it. I could manage it myself.

  A. needn’t do B. needn’t have done

  C. mustn’t do D. shouldn’t have done

  【解析】根據句意可知Catherine對對方為她打掃了房間表示感謝並提到對方不必為她打掃

  房間。

  【答案】B

  ② The boss has given everyone a special holiday, so we go to work tomorrow.

  A. can’tB. mustn’t C. needn’tD. shouldn’t

  【解析】老闆給所有的員工放了假,所以我們明天不必再去上班。

  【答案】C

  (4)would (not) have done本來(不)會發生某事,但卻(發生了)或沒有發生。常用於虛擬條

  件句或含蓄虛擬條件引導的虛擬語氣,表示對過去所發生事情結果的假設。例如:

  He hesitated for a moment before kicking the ball, otherwise, he ________ a goal.

  A. had scored B. scored

  C. would scoreD. would have scored

  【解析】句中otherwise為含蓄條件,相當於if he had not hesitated for a moment before kicking

  the ball,這是對過去的一種虛擬假設。

  【答案】D

  (5) might have done表示“本來可能……”,但實際上沒有發生的事。例如:

  What a pity! Considering his ability and experience, he ________ better.

  A. need have done B. must have done

  C. can have done D. might have done

  【解析】真是可惜!考慮到他的能力和經驗,他本來可以做得更好的。

  【答案】D

  (三)表達“情感、態度、語氣” 等方面的情態動詞

  1. must表達“情感、態度、語氣”主要有以下用法:

  (1) 表示主觀的義務和必要,主要用於肯定句和疑問句,意思為“必須……,得……,要……”;

  由must引起的疑問句,肯定回答要用must或have to, 否定回答要用needn’t或don’t have to,

  意思是“不必”。另外,must與have to都可以表示“必須”這一含義。must表示一種主觀的需

  要,而have to表示一種客觀的需要,意思是“不得不”,其否定形式是don’ have to。

  例如: -What sort of house do you want to have? Something big?

  --Well, it ______ be big--that's not important.

  A. mustn't B. needn't C. can't D. won't

  【解析】Something big?此處意為:Must it be big? 回答者的意思是:房子不必太大—那並不

  重要。

  【答案】B

  (2) must的否定形式mustn’t表示禁止,意思是“不能,不許”。例如:

  When I was young, I was told that I ______ play with matches

  A. wouldn't B. needn't C. mustn't D. daren't

  【解析】當我年輕的時候,(家人)就一直告誡我千萬不要玩火柴。

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