【正文】 =Perhaps/Maybe/Possibly the railways will be improved.鐵路可能會(huì)得到改進(jìn)。）理論上的可能性(can)比事實(shí)上的可能性(may)更弱。（考慮到跡象如此，再無別的結(jié)論=It seems certain that….）:They must be very tired now, for they have been working the whole morning.他們現(xiàn)在一定是非常累了，因?yàn)樗麄冋麄€(gè)上午都在工作。（=It is possible that he didn’t know the truth.）He cannot know the 。不，不會(huì)是王紅，因?yàn)樗裉煸绯烤蛣?dòng)身去上海了。填D。t be 39。He could be very 。m afraid it _____ be pouring down soon. 　　 A,can B,must C,should D,might【分析】could和might表示現(xiàn)在的情況時(shí)，更帶有不肯定性和慎重味道，構(gòu)成禮貌或婉轉(zhuǎn)說法，包含或許的意思：A:I wonder where Tom is. B:He may/might/could be in the library.(Perhaps he is in the library.)因此在wonder, fear,be afraid等后接的從句中,通常用may/might/could,表達(dá)一種探詢的觀點(diǎn)：I was afraid you might be out of 。How old may his father be?他父親到底有多大年紀(jì)？（比How old is his father?委婉的說法。t be　39。must + have + ed分詞: 用于肯定句, 表示推測過去某事“肯定,一定，準(zhǔn)是”發(fā)生了。could 比can更表示說話人語氣的不肯定。他已去了中國。許多評(píng)論者認(rèn)為這類句子是不可能成立的，但它們正在為越我來越多的人所接受和使用，在美國英語中尤其如此?！究祭?9。試比較：Our guests must be home by now.(‘I am certain’)我們的客人現(xiàn)在一定到家了。析：填C。這類試題往往通過題干的其他部分或附加句子提供某個(gè)信息，然后讓考生根據(jù)這個(gè)信息進(jìn)行合理推理，產(chǎn)生新的想法和認(rèn)識(shí)。鞏固練習(xí) __ be a policeman, for he39。t B. can39。t,may 39。t very sure yet. on more __ be taken feeling cold with only a shirt on. 39。t have arrived 39。t be 39。t have hurried have written it out 39。had not taken be warned。ve told him already. 39。t new airoprt __ if they had not stopped working on it. plete been pleted pleted have been pleted didn39。t have spoken 39。s __ e,but why didn39。 由句中的時(shí)態(tài)可知是在對過去的事件進(jìn)行推測，故用情態(tài)動(dòng)詞+have done。 may不可表示過去的事。 。除所給答案外，A也正確。t表示“禁止”，may表示“不可能” can表示“理論上的可能、普遍性的可能、當(dāng)然的可能，并非說話人主觀認(rèn)為可能，即并非猜測”，故不可選A。t have 39。t have spoken 39。t 39。had not taken stayed at a hotel while in New York. Oh,did you?You __ with Barbara. have stayed stay stay have stayed I39。t told told Sally how to get there ,but perhaps I __ for her. to wirte it out have written it out have written it out to write it out you had worked harder,you __. succeed succeeded succeed have succeeded he __,he __that food. luckily he wsa sent to the hospital immediately. warned。t have been __you more help,even though he was very busy. have given give have given give Jane waooked away from the ,she __ something the would regret later. said say have said was plenty of __.39。t have arrived not have arrived were already five people in the car but they managed to take me as well. It __ a fortable journey.39。 __ be here at any moment. didn39。t,shouldn39。t,can39。不能單憑語法規(guī)則做題。杰克很可能隨時(shí)會(huì)到。）Our guests should(ought to) be home by now.(‘They probably are,but I’m not certain.)我們的客人現(xiàn)在該到家了。clock. Jack ____be here at any moment. (NMET95)　 　　　　 　　　 　　　　 　　　　 【分析】should(ought to)表示很可能、預(yù)期的意思，指一種嘗試性推論，可認(rèn)為是must的語氣較弱的對應(yīng)詞，意思是”應(yīng)該會(huì)、一定。析：答案A、D。例如Can they have missed the bus?的答句是：Yes,they may have ,they can have 。I can’t find my keys. I may / might have left them at the school yesterday.Jack can’t have arrived yet,otherwise he would have telephoned me.（上海1997）It couldn39。 may(might) + have + ed 分詞: 用于肯定句和其他否定句, 表示對已發(fā)生事情的不肯定的推測, 意為“可能, 大概”, 其中might較may語氣更弱, 把握更小。t have been　　　39。他怎么可能會(huì)在開幕式上遲到呢？）【考例】1. Sorry I39。Can用于一般疑問句時(shí)，還可表示驚訝或懷疑，意思是”（到底）可能有這