【正文】 n39。t/couldn39。 表示推測(可能、大概) ①This will be the house you are looking for. ②I would be about ten when my father left home.t have a pen, a pencil will do.②We tried the door again，but it wouldn39。其后既可接表動作的動詞，也可接表狀態(tài)的動詞。would更委婉 表示某種傾向或習(xí)慣性動作 ①Fish will die without water. ②Every time she was in trouble，she would turn to him for help. (would指過去某一段時間的情況，常與表示過去的時間狀語連用，意為“總是，總會”，后面只能接動作性的動詞。t see. t get out, I shall knock you down. (警告)用于第二、第三人稱。 表示說話人的意愿，有“命令，允諾，警告，決心”等意思。t dare (to) go out alone at night. (在否定句中to有時可省略) 情態(tài)動詞意義 例句 備注 shall 表示征詢意見。用作實義動詞時，可用于各種句式。t cross the river.②How dare you say that to me？dare和need一樣，既可以作情態(tài)動詞，也可用作實義動詞。t need to go at once. —Do you need to go at once？—Yes，I do.②need作情態(tài)動詞常用于否定、疑問或條件句中。t.①need可以作實義動詞，用于各種句式。 3. need, dare 情態(tài)動詞例句 注意事項 need①I needn39。t to)；疑問式：Ought …to…？ 竟然 It is strange that he should react in this way. 表示驚訝、意外等語氣。 偏要硬要非要①Why must you always interrupt me？②—Can I borrow your car, Mum？—If you must. 表示與說話人愿望相反及不耐煩。如：They had to speed up, for the weather turned terrible. ②Must I/we…？的否定回答不能用mustn39。t have to./Yes, you must. ③You mustn39。 , should 情態(tài)動詞意義 例句 備注 must 必須 ①We must help each other to overe the difficulties. ②—Must I finish the work today？—No, you needn39。 請求 —Can/Could you lend me a hand？—Yes, I can. 情態(tài)動詞意義 例句 備注 may/might允許或請求 ①You may take this if you like.②May/Might I ask for a photo of your baby？ can與could、may與might不表時態(tài)差異，只是語氣上的差別，could/might比can/may更委婉。如：Because he practised hard, he was able to pass the driving test. 情態(tài)動詞意義 例句 備注 can/could允許(有時可與may互換) Can/May I have a look at your photos？ can與could、may與might不表時態(tài)差異，只是語氣上的差別，could/might比can/may更委婉。 二、情態(tài)動詞的其他用法1．can, could, may, might情態(tài)動詞意義 例句 備注 can/could能力 ①I can see some birds flying in the sky. ②Could the girl read before she went to school? could表示泛指過去的某一能力。C項表示推測語氣不太肯定。 注意：should (ought to)表示推測是高考考查的重點和難點。一般句末有時間狀語，或有語境暗示。clock now. He should be in the office now. ②Hi, Mum! I39。理論上①It39?？隙ň淝閼B(tài)動詞 意義 語氣 句式 語境 例句 備注 should /ought to應(yīng)該 ，理應(yīng) t have discovered the truth. ①對現(xiàn)在的行為或狀態(tài)的推測：must/may/might/can/could＋do ②對過去的行為或狀態(tài)的推測：must/may/might/can/could have done may/might(might可能性小于may)可能可能性較小，尤其might最不肯定肯定句、否定句(可能不)can/could (could可能性小于can)可能例句：Can/could you help me?2. 情態(tài)動詞的表現(xiàn)形式1） 情態(tài)動詞+do 例句：We must help each other to overe the difficulties. You shouldn’t be so careless.2） 情態(tài)動詞+be doing 例句：She must be sleeping now. My mother may/might be cooking now3） 情態(tài)動詞+be done 例句：Difficulties can and must be overe. Something must be done to stop pollution.4） 情態(tài)動詞+have done 例句：You ought to have e earlier. They might have finished the work. 情態(tài)動詞的分類1. 只能作情態(tài)動詞：must, can/could, may/might2. 可作情態(tài)動詞也可作助動詞的：will/would, shall/should3. 可作情態(tài)動詞有可作實義動詞的：need， dare4. 具有情態(tài)動詞特征的：ought to, have to, be able to 分類講解 /could 1)表示能力：會，在表示過去的能力時用could 例句：I can swim. Lucy can dance well and her mother could dance well when she was young. The cinema can seat 500 people. I could not read such an easy book when I was 7 years old.2) 表允許，許可常用在口語中，此時could 不表示過去式，而表示語氣上比can更客氣。虛擬語氣的考點主要集中在名詞性從句、條件句中的用法，以及錯綜條件句中虛擬語氣的應(yīng)用。 情態(tài)動詞主要用來表示說話人的情感、態(tài)度等，是中學(xué)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(tài)動詞在近五年高考中主要考查四點：情態(tài)動詞表示推測和可能性的用法；情態(tài)動詞與虛擬語氣；情態(tài)動詞表達(dá)“情感、態(tài)度、語氣等”；情態(tài)動詞表示 “必要性”等方面的用法。 概念1. 什么是情態(tài)動詞?本身有一定詞義，是表達(dá)說話人的情感、態(tài)度、語氣的詞，其作用是給動詞增添感情色彩?表現(xiàn)形式：情態(tài)動詞+動詞原形/be2. 特點?沒有人稱和數(shù)的變化?不能直接跟賓語，必須搭配實義動詞或be動詞的原形?情態(tài)動詞的過去式往往不表時態(tài)，而表示更加委婉的語氣。例句：Could I use your dictionary? Yes,go ahead./Yes, you can.(不可以說Yes, you could.) He asked me whether he could take the book out of the reading room.一、 情態(tài)動詞表推測的用法 情態(tài)動詞 意義 語氣 句式 語境 例句 備注 must一定 可能性最大 肯定句 對具體事實的判斷①A：Look，someone is ing. Who can it be? B: It may be our headmaster. A: It can’t be him. He has gone to Shanghai. B: It must be Mr. Wang. He looks like our headmaster. ②That may not be true. ③He couldn39。疑問句、否定句(不可能)、(could有時也用于肯定句)有時會s 8 o39。m on the bus. I should be home in about ten minutes. 常表示在一段時間內(nèi)可能發(fā)生的事或某人的期望。所表示的猜測發(fā)生的可能性很大。如：— When can I e for the photos？I need them tomorrow afternoon.— They ________ be ready by 12：00. A．can B．should C．might D．need 【解析】 B　A項表示推測時常用于否定句和疑問句中。should意為“按理說，理應(yīng)”，既回答了顧客的詢問，不失禮貌，又為照片有可能尚未洗好，顧客到時取不到留下了回旋的余地，體現(xiàn)了店主的精明與用詞經(jīng)過仔細(xì)推敲。表示過去有能力并且成功地做了某事，通常用was/were able to do，相當(dāng)于managed to do/succeeded in doing。注意在回答時不能用could/ might。注意在回答時不能用could/ might。t/you don39。t take photos here, and it is forbidden. ①must表示主觀意志，have to表示客觀。t。 情態(tài)動詞意義 例句 備注 should 應(yīng)該(常與oughtto通用)You should be polite to the old. ought to 的否定式：o