【文章內(nèi)容簡(jiǎn)介】 gine what I would be doing today if I _______ in love, at the age of seven, with the Melinda Cox Library in my hometown.A. wouldn39。t have fallen B. had not fallenC. should fall D. were to fall答案為B?！窘馕觥? 根據(jù)句意和I would be doing可以判斷這是虛擬語(yǔ)氣。at the age of seven 是表示過(guò)去的時(shí)間狀語(yǔ)，if從句中的謂語(yǔ)要用had not fallen，表示對(duì)過(guò)去情況的假設(shè)。由于主句中的謂語(yǔ)表示對(duì)現(xiàn)在的虛擬，條件句中的謂語(yǔ)表示對(duì)過(guò)去情況的虛擬，增加了試題的難題，但是，使用排除法可以容易地做出該題：should fall 和were to fall都可以用于條件句中表示對(duì)將來(lái)的虛擬；wouldn39。t have fallen不用于條件句中，所以都不能作為答案。譯文：如果我不在七歲時(shí)就迷戀上了我們家鄉(xiāng)的Melinda Cox圖書(shū)館，我真不能想象我今天會(huì)做什么。 例You can39。t imagine that a wellbehaved gentleman ________be so rude to a lady.A. might B. need C. should D. would答案為C?！窘馕觥? should用于表示感情，意向等句中的that從句，表示“竟然……，居然……”的驚訝，出乎意料。譯文：你難以想象一位行為體面的紳士會(huì)對(duì)一位女士那么粗魯。例What would have happened ________, as far as up to the river bank?A. Bob had walked farther B. if Bob should walk fartherC. had Bob walked farther D. if Bob walked farther答案為C。【解析】 因?yàn)橹骶涞闹^語(yǔ)動(dòng)詞用了would have happened，所以從句的謂語(yǔ)動(dòng)詞要用過(guò)去完成時(shí)。在虛擬語(yǔ)氣中，如果條件狀語(yǔ)從句中的if省略，該句要倒裝。譯文：如果鮑勃走得遠(yuǎn)一點(diǎn)，走到岸邊，會(huì)發(fā)生什么事呢? 例Mr. Bush is on time for everything. How ________it be that he was late for the opening ceremony?A. can B. should C. may D. must答案為A?！窘馕觥? can表示可能性的推測(cè)，常用于疑問(wèn)句或否定句中；may表“可能性”常用于肯定句或否定句中；must常用于肯定句中表推測(cè)，“一定……”的意思。注意：can not表示“不可能”，而may not表示“或許不……可能不……”，兩者語(yǔ)氣上有區(qū)別。譯文：布什先生按時(shí)做好一切事。他來(lái)參加開(kāi)幕式遲到了可能會(huì)是什么樣的情景呢? 例My sister met him at the Grand Theatre yesterday afternoon, so he _________ your lecture.A. couldn39。t have attended B. needn39。t have attendedC. mustn39。t have attended D. shouldn39。t have attended答案為A?！窘馕觥? “情態(tài)動(dòng)詞+不定式完成式”有各自的含義。must have done表示對(duì)過(guò)去事情的肯定推測(cè)，多用于肯定句中；needn39。t have done表示過(guò)去本不必做的事情；shouldn39。t have done表示過(guò)去做了不該做的事情；can39。t (couldn39。t) have done表示對(duì)過(guò)去的否定性推測(cè)，意為“不可能”。所提供的情境My sister met him at the Grand 表示他不可能參加講座。 例He hesitated for a moment before kicking the ball, otherwise he_________ a goal.A. had scored B. scored C. would score D. would have scored答案為D?！窘馕觥? 根據(jù)otherwise可以判斷出要用虛擬語(yǔ)氣。表示過(guò)去發(fā)生的事要用would have scored。譯文：在踢球前他猶豫了一會(huì)兒，否則他就會(huì)射中球門。例Oh, I39。m not feeling well in the stomach. I _______ so much fried chicken just now.A. shouldn39。t eat B. mustn39。t have eaten C. shouldn39。t have eaten D. mustn39。t eaten答案為C。【解析】 just now是表示過(guò)去的時(shí)間狀語(yǔ)。情態(tài)動(dòng)詞在表示過(guò)去發(fā)生的事時(shí)，必須用“情態(tài)動(dòng)詞+have+過(guò)去分詞的形式”。所以只能在選項(xiàng)B或C中確定答案。mustn39。t have eaten是一個(gè)錯(cuò)誤選項(xiàng)，因?yàn)椤癿ustn39。t+動(dòng)詞”表示“禁止”，不表示判斷或推測(cè)。譯文：噢，我覺(jué)得胃不舒服。我剛才不應(yīng)該吃那么多炸雞。 例I was really anxious about you .You_________ home without a word.A. mustn39。t leave B. shouldn39。t have leftC. couldn39。t have left D. needn39。t leave答案為B?！窘馕觥? should39。 t have done表示本來(lái)不應(yīng)該做而做了，含責(zé)備意味。譯文：我真為你著急，你不應(yīng)該不說(shuō)一句話就離開(kāi)了家。另外注意mustn39。t+動(dòng)詞表示“禁止”。 第三節(jié) 鞏固練習(xí)Direction: Beneath each of the following sentences there are four choices marked A. B. C and D. Choose the best answer that pletes the sentence.1. —Isn39。 t that Ann39。s husband over there?—No, it _______ be him . I39。m sure he doesn39。t wear glasses.A. can39。t B. must not C. won39。t D. may not　　　　　 　　to the meeting this afternoon if you have something important to do.　　A. needn39。t to e　　　 B. don39。t need e　C. don39。t need ing　　 D. needn39。t e 3. He　　　　 　you more help, even though he was very busy.　　　　 　A. might have given　　 B. might give　C. may have given　　　 D. may give 4. —　　　　　 　I help you with some shoes, madam?—Yes, I would like to try on those brown ones.　　　　　　　　　　　 A. Will　　 B. Should　　 C. May　　 D. Must 5. The reason why they