【正文】 No, you needn’t./ No, you don’t have ）表示猜測，意為“想必，準(zhǔn)是，一定”，只用于肯定句中This must be your at his new must have a lot of )表示討厭情緒“偏偏”I am sleeping when you must turn your radio ：have to 表示“必須”，“不得不”，在這個(gè)意義上與must 很接近，但must 表示的是說話人的主觀看法，而 have to表示的卻是客觀需要。注意：在回答由must 引起的問句時(shí)，如果是否定回答，不能用mustn’t ,而要用needn’t 或don’t have to ,因?yàn)閙ustn’t 是“不準(zhǔn)、禁止”的意思。例如：He may be very busy may not be at ：表示可能性時(shí)，can’t 語氣強(qiáng)表示“不可能”；may not 語氣弱，表示“可能不（或許）”。注意：回答may 引起的問句時(shí)，否定形式用must not(禁止)，had better not(最好別)。這時(shí),be able to相當(dāng)于managedto 或succeeded in doing ,表示經(jīng)過一番努力，終于能夠……。也可以指現(xiàn)在時(shí)間,表示語氣緩和I didn39。C that is 60176。例如：+be done+be doingmust+have done+have been done+have been doing注意：和used(to)例外，動(dòng)詞不定式要帶上”to”一、情態(tài)動(dòng)詞的用法：1．can1）表示能力“能夠，會(huì)”She can drive, but she can’t ride a you give me a lift to the station?2）表示對現(xiàn)在動(dòng)作或狀態(tài)進(jìn)行主觀的猜測“可能、會(huì)”，或表示驚異，懷疑，不相信等態(tài)度，主要用在否定句、疑問句或感嘆句中。第一篇：2014屆高三英語語法講解——情態(tài)動(dòng)詞情態(tài)動(dòng)詞概述：情態(tài)動(dòng)詞表示說話人的情感態(tài)度。它有一定的實(shí)在詞義（如：能、會(huì)、可能、以前、最好、寧愿），只有謂語特性，必須和其他動(dòng)詞一起構(gòu)成謂語。例如：He can’t have a lot of it be that it was I, not he, who was mistaken?How can you be so careless!3）表示客觀可能性“可能”，可用于肯定句As a human being, anyone can make a temperature can fall to60176。C below ）表示允許“可以”，意思與may 相近，主要用在口語中Can I have a look at your copy of China Daily?This sort of thing can’t go ）構(gòu)成下列特殊句式：①cannot /can never …too … 或 cannot …enough越…越好；非常．．．．．．One cannot be too cannot thank you can’t praise him too highly.②cannot help doing …/cannot help but do …/cannot but do …禁不??；不由得；不得不 I cannot help admiring the picture whenever I look at a close friend dies, you cannot but feel 1)表示能力,指的是過去時(shí)間In those days few workers could support their couldn’t follow the teacher in )表示允許,指的是過去時(shí)間She asked whether she could take the books out of the )表示可能,可以指過去時(shí)間。t think the story could be you mustn’t smoke while you’re walking around in the bush could start a looks couldn’t be over ,)比較委婉客氣地提出問題或陳述看法,指的是現(xiàn)在時(shí)間Could I see your license?I have a few could ring to see if they’re (could)與be able toCan(could)和be able 只有現(xiàn)在式和過去式,而be able to one is able to do it.= No one can do you be able to e tonight?I’m sorry I haven’t been able to answer your said she had not been able to e ,在表示成功地完成某一具體動(dòng)作時(shí)用be able to 來表示。例如：1）Were able to escapepeople2）Managed to escapeinto the ）succeed in escaping3．May1)表示許諾“可以”或詢問、說明一件事。May I trouble you with a question?—Could I call you by your first name ?—Yes, you may./No, you mustn’t./No, you’d better ).表示表示主觀的推測“或許”，通常用在肯定句和否定句中。4．might1)表示可以做的事，指的是過去時(shí)間He asked if he might look through my ）表示口氣比較婉轉(zhuǎn)客氣，指的是現(xiàn)在時(shí)間Might I ask for a photograph of your baby?I wonder if I might borrow some ）表示可能發(fā)生的事，可以指過去時(shí)間；也可以指現(xiàn)在時(shí)間，但表示語氣更加不肯定She was afraid they might not like the might have a lot of work to do now but I’m not ．must1)表示必須要做的事，否定表示“禁止”We mustn’t move someone if they are badly ，你一定不要挪動(dòng)他。Must we send in our plan this week?Yes ,you must.。另外，have to比must 有更多的形式。6．should和ought to “應(yīng)該”1)表示應(yīng)該做的事，should 和 ought to 一般可以通用。試比較I’ll start the work 。2）表示推測，意為“想必一定，照說應(yīng)該，估計(jì)”。試比較 must be home by now.（肯定） ought to(should)be home by now.（不能肯定）7．shall1)用于第一、三人稱，構(gòu)成疑問句，表示征求對方意見或請求指示Shall I open the window?Shall the boy wait outside?2)用于第二、三人稱，表示說話人的意愿，表示“命令、警告、威脅、強(qiáng)制、允諾、決心” You shall do as I say.（命令）Tell him that he shall have the book tomorrow.（允諾）If you children don’t do as I tell you, you shall not go to the party.（威脅）You shall be sorry for what you 。（決心）8．will1)表示“意志，意愿”，可用于多種人稱 I will do anything for our you will read the book, I will lend it to ，我會(huì)把它借給你。2）will 在疑問句中用于第二人稱，表示詢問對方的意愿或向?qū)Ψ教岢稣埱骔ill you open the door for me, please?Pass me the glass, will you?遞給我杯子，好嗎？有時(shí)，這種句子也可以是won’t you have a little more rice ?3）表示某種傾向或習(xí)慣性動(dòng)作，意為“總是會(huì)，老是，就是”；否定結(jié)構(gòu)意為“不肯、不能”。也可表示委婉地提出看法、請求、建議等I would like to have a 。.used to在肯定句中，used to 表示過去（曾經(jīng)）的動(dòng)作或狀態(tài)，現(xiàn)在“已不”.I used to get along very well with my cousin and we used to be very good you use to go to the same school?I didn’t use to used to be a policeman, didn’t he?Did you use to take a walk in the morning?used to 常用來表示表示已不復(fù)存在的過去的習(xí)慣，側(cè)重與現(xiàn)在的對比，而would用來表示過去反復(fù)發(fā)生的動(dòng)作。11． needneed 作為情態(tài)動(dòng)詞，主要用于否定句，疑問句中。注意：回答由need 引起的問句時(shí)，肯定回答一般用must ,否定回答時(shí)用needn’ I give you the book?Yes ,you ,you needn’ 用作及物動(dòng)詞，和不定式連用，可用于各種結(jié)構(gòu)。(dared)dare及其過去式dared 作為情態(tài)動(dòng)詞，主要用于疑問句、否定句和條件狀語從句中。I dare say my uncle will do 還可以作及物動(dòng)詞，跟不定式，用于各種結(jié)構(gòu)。We must dare to did not dare(to)look 。otherwise she would have replied before 、may / might have +過去分詞，表示對已發(fā)生的事情做不肯定的推測A potentially serious leakage of radioactive water may have been caused by an 、needn’t have + 過去分詞，表示做了不必做的事，相當(dāng)于“didn’t need to do” As it turned out to be a small house party, we needn’t have dressed up so 、should have +過去分詞，表示應(yīng)該做某事但實(shí)際上未做I should have planned everything ahead 、could have +過去分詞，表示過去本來可以做但卻未做You could have phrased it more tactfullymay/ might have +過去分詞，表示過去可以做但實(shí)際未做It might have been better to include more punchy statistics and photos of equipment in the introduction to further assist firsttime office automation 、其他情態(tài)動(dòng)詞must ,can/could ,may /might表推測句子的反義問句的構(gòu)成。例如：He must be worki