【正文】 e been　　　39。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。析：答案A、D。）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。不能單憑語法規(guī)則做題。t,can39。 __ be here at any moment. didn39。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。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 have spoken 39。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。 。 may不可表示過去的事。s __ e,but why didn39。t new airoprt __ if they had not stopped working on it. plete been pleted pleted have been pleted didn39。had not taken be warned。t be 39。t very sure yet. on more __ be taken feeling cold with only a shirt on. 39。t B. can39。這類試題往往通過題干的其他部分或附加句子提供某個信息，然后讓考生根據(jù)這個信息進(jìn)行合理推理，產(chǎn)生新的想法和認(rèn)識。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。許多評論者認(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。could 比can更表示說話人語氣的不肯定。t be　39。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，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 。t be 39。不，不會是王紅，因?yàn)樗裉煸绯烤蛣由砣ド虾Ａ?。（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€上午都在工作?，F(xiàn)結(jié)合近幾年的高考題目，對表推測的情態(tài)動詞的用法作一歸納，希望對各位考生會有所幫助：【考例】1. Naturally, after I told her what to do, my daughter _____ go and do the opposite! 　　　　　　 A. may B. can C. must D. should (2003年普通高等學(xué)校春季招生統(tǒng)一招生考試英語試題（安徽卷）)【分析】Can,may,must都可用來表示”推測”，但側(cè)重點(diǎn)各有不同：May常用來指”事實(shí)上的可能性”，而can則表示一種”理論上的可能性”例如：The railways may be improved.=It is possible that the railways will be improved.=Perhaps/Maybe/Possibly the railways will be improved.鐵路可能會得到改進(jìn)。Look at the time! We should have been at the theatre ten minutes ago. 瞧都什么時候了! 十分鐘前我們就該到戲院了。You might at least have answered my letter. 你至少可以回我一封信嘛。如：He may [might] tell his wife. 他也許會告訴他妻子。如：You could have helped him. 你本來應(yīng)該幫助他的。如：Even experienced teachers can make mistakes. 即使是有經(jīng)驗(yàn)的教師也可能出錯。 as D. such。t buy it.A. because B. when C. that D. if( ) 2 I got there ___ late ___ I didn39。 and C. Though。t. At least, not___yours.A. as big as B. as big than C. as bigger than D. bigger as( ) 3 Suzhou is not ____ beautiful ____ Hangzhou.A. as。 studying5( ) 1 Betty didn39。t seen。 did。 has bought . D. has had。 will be D. won39。t go。 until。 until B. didn39。 until D. didn39。 after。t。t start the work ___ their teacher came back.A. until B. while C. as soon as D. if2( ) 1 Tom will call me as soon as he ___ Shanghai.A. arrives B. will reach C. arrives in D. get to( ) 2 I39。 was ringing B. were watching。 have。t go to see the film tonight, b