【文章內(nèi)容簡(jiǎn)介】 實(shí)相反用過(guò)去完成時(shí)；與將來(lái)事實(shí)相反，用would/could/might＋動(dòng)詞原形。It seems as though it were spring already．看起來(lái)好像已經(jīng)是春天了。(事實(shí)上不是)The girl is giving us a vivid description of the moon．It seems as if she had been to the moon many times．這個(gè)女孩對(duì)月球的描述非常逼真，就好像她去過(guò)月球很多次似的。He opens his mouth as if he would say something．他張開(kāi)嘴巴，好像要說(shuō)什么?！　‰y點(diǎn)釋疑 難點(diǎn)一　情態(tài)動(dòng)詞的易混點(diǎn)1．can與be able to表示“經(jīng)過(guò)努力設(shè)法做成某事”時(shí)不用can，應(yīng)用be able to can表示“能力”時(shí)，側(cè)重于因有某種知識(shí)和技能而能辦到某事。【典例】　用could或was able to填空The fire spread through the hotel very quickly, but everyone __was able to__ get out．解析：由句意可知此處應(yīng)該是所有人經(jīng)過(guò)努力最后出去了，所以應(yīng)該用was able to。2．表示推測(cè)的can39。t與may notcan39。t表示“不可能”，may not表示“可能不，或許不”。很明顯，can39。t比may not語(yǔ)氣強(qiáng)?！镜淅俊t __can39。t__ be the postman at the door．It39。s only six o39。clock now．解析：can39。t不可能，在此表示有把握的否定推測(cè)，符合句意。3．can39。t，mustn39。t，needn39。t can39。t指“無(wú)能力”：mustn39。t指“不允許，一定不要”；needn39。t指“不必”：【典例】　用can39。t，musn39。t或needn39。t填空(1)There is a meeting inside．You __mustn39。t__ make any noise．解析：句意：里面在開(kāi)會(huì)，你不許制造任何噪音。故應(yīng)填mustn39。t。(2)He is too young and __can39。t__ make a living．解析：句意：他太小了不能維持生計(jì)。故應(yīng)填can39。t。(3)According to today39。s weather report, it does not rain, so you __needn39。t__ take the umbrella．解析：句意：根據(jù)今天的天氣預(yù)報(bào)，今天不下雨，所以你沒(méi)有必要帶雨傘。故應(yīng)填needn39。t。難點(diǎn)二　對(duì)現(xiàn)在/將來(lái)/過(guò)去的推測(cè) 情態(tài)動(dòng)詞可以用來(lái)對(duì)現(xiàn)在、將來(lái)和過(guò)去進(jìn)行推測(cè)，常用來(lái)表示推測(cè)的情態(tài)動(dòng)詞有can/could，may/might，must，ought to/should等。1．情態(tài)動(dòng)詞＋do(1)“must＋do”表示對(duì)現(xiàn)在的情況進(jìn)行有把握的推測(cè)，一般用于肯定句，語(yǔ)氣最強(qiáng)。There must be something wrong．一定出了什么差錯(cuò)。(2)“may/might/can/could＋do”表示對(duì)現(xiàn)在或?qū)?lái)發(fā)生的事情的推測(cè)。 It might snow tomorrow or it might be merely cloudy．明天可能下雪，或者可能只是多云。(3)“ought to/should＋do”意為“(按道理說(shuō))應(yīng)該……”，表示有把握的推測(cè)，但語(yǔ)氣上留有余地。It should be Mike who has taken away all the materials．He said he would．應(yīng)該是邁克拿走了所有的材料。他說(shuō)過(guò)他要拿。2．情態(tài)動(dòng)詞＋be doing“must＋be doing”表示“準(zhǔn)是正在做……，一定正在做……”。They must be talking about us．他們一定正在談?wù)撐覀儭?3．情態(tài)動(dòng)詞＋have done表示對(duì)過(guò)去發(fā)生的事情的推測(cè)。(1)must have done意為“一定做了……，準(zhǔn)是做了……，”表示非常有把握的肯定推測(cè)；can39。t/couldn39。t have done意為“不可能做了……”，表示非常有把握的否定推測(cè)。(2)may/might have done意為“可能/也許做了……，”表示對(duì)已經(jīng)發(fā)生的事情把握較小的推測(cè)。注：“情態(tài)動(dòng)詞＋have done”的用法在前面已進(jìn)行了詳細(xì)解釋，在此只是簡(jiǎn)單歸納。　　解題策略 情態(tài)動(dòng)詞和虛擬語(yǔ)氣解題“兩注意”注意一：若句中謂語(yǔ)動(dòng)詞為原形，在其前設(shè)純空格題時(shí)，注意考慮情態(tài)動(dòng)詞。然后根據(jù)句意或句式結(jié)構(gòu)填入恰當(dāng)?shù)那閼B(tài)動(dòng)詞。注意二：一旦判斷所給動(dòng)詞在句中作謂語(yǔ)，就要考慮其時(shí)態(tài)、語(yǔ)態(tài)、語(yǔ)氣、主謂一致等，特別是注意虛擬語(yǔ)氣中的時(shí)態(tài)。判斷虛擬語(yǔ)氣，除了常見(jiàn)的if虛擬條件句，還應(yīng)注意其他常搭配虛擬語(yǔ)氣的標(biāo)志詞，如suggest，would rather，as if，wish，otherwise，or，but for等?！镜淅?】　—I __can39。t__ thank you enough for what you have done for me．—You39。re wele．解析：can39。t/can not．．．enough表示“再……也不為過(guò)”，符合句意。故填can39。t?！镜淅?】　We took a taxi to the airport．Otherwise we __would have been__(be) late．解析：根據(jù)語(yǔ)境可知，后一句表示與過(guò)去事實(shí)相反的假設(shè)，其謂語(yǔ)應(yīng)用would have been?！　∫族e(cuò)聚焦 1．表達(dá)的單調(diào)性例如在寫(xiě)一封回信向好友表達(dá)建議時(shí)，重復(fù)使用You should．．．既顯得單調(diào)，同時(shí)強(qiáng)硬的語(yǔ)氣影響了交際效果。我們可以靈活多樣地表達(dá)建議，如You39。d better．．．/You might as well．．．/Why not．．．？等。2．情態(tài)動(dòng)詞搭配錯(cuò)誤達(dá)標(biāo)檢測(cè) Ⅰ．單句語(yǔ)法填空1．(2020天津卷改編)Jim says we __can__ stay in his house as long as we leave it clean and tidy．解析：考查情態(tài)動(dòng)詞。句意：吉姆說(shuō)我們可以住在他的房子里，只要我們保持它干凈整潔。根據(jù)后面的“as long as we leave it clean and tidy”可知，Jim許可我們待在他的房子里，即：我們“能，可以”待在他的房子里。故填can。2．(2020江蘇卷改編)If I hadn39。t been faced with so many barriers, I __would/could/might/should__not be where I am．解析：考查虛擬語(yǔ)氣。句意：如果我沒(méi)有面對(duì)那么多的障礙，我現(xiàn)在就不會(huì)在這里。分析句子成分可知，此處是錯(cuò)綜時(shí)間虛擬語(yǔ)氣，根據(jù)空后where I am可知，此處是與現(xiàn)在事實(shí)相反的假設(shè)，主句謂語(yǔ)動(dòng)詞應(yīng)使用would/could/might/should＋do。故填would/could/might/should。3．Jack is a great talker． It39。s high time that he __did/should do__ (do) something instead of just talking．解析：考查固定句型It is high time that sb． did/should do st