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be now ? 他現(xiàn)在可能會(huì)在哪呢?Can the news be true ? 消息會(huì)是真的嗎?They must be playing basketball on the 。He can39。t be writing his 。對(duì)某個(gè)狀態(tài)或 過去發(fā)生的事情進(jìn)行推測(cè)在情態(tài)動(dòng)詞后加上 have done 例如:1)肯定的推斷:may have done , must have done2)否定的推斷:can39。t have done,couldn39。t have done3)疑問的推斷:can(could)have done例句: They may have settled the problem.(他們可能已經(jīng)解決了這個(gè)問題。)I might have e to a wrong conclusion.(我可能得出了一個(gè)錯(cuò)誤的結(jié)論。)The road idn39。t wet , It can39。t have rained last night.(路面沒濕,昨天夜里肯定每下雨。)Could Mary have missed the first bus ? She got up very early.(怎么瑪麗會(huì)趕不上車嗎?他起得很早的。)(三)幾個(gè)應(yīng)注意的問題1)情態(tài)動(dòng)詞+have done 可以表示對(duì)過去所發(fā)生事情的一種責(zé)備語(yǔ)氣。如:I could have done the work better.(我本來(lái)可以做得更好。自責(zé)自己沒有把事情做好,感到惋惜、遺憾)You should have thought of that.(你本應(yīng)當(dāng)想到這一點(diǎn)。責(zé)怪你沒有想到。should have done 表示本應(yīng)該做而沒有做的事情。)You shouldn39。t have told them that.(你本不應(yīng)當(dāng)告訴他們那件事。shouldn39。t have done表示本不應(yīng)該做而做了的事情。)You needn39。t have told them that.(你本不必告訴他們那件事。needn39。t have done表示本不必做而做了的事情。)2)情態(tài)動(dòng)詞dare 和 need 還可以用作實(shí)義動(dòng)詞。在肯定句中多用于實(shí)義動(dòng)詞,在疑問句和否定句中多用情態(tài)動(dòng)詞,用于實(shí)義動(dòng)詞時(shí)有人稱和數(shù)的變化。例如:He needn39。t worry about us now.(他不必為我們擔(dān)心。need 為情態(tài)動(dòng)詞)She dares to stay at home alone at night.(夜里她敢獨(dú)自一人呆在家里。dares 為實(shí)義動(dòng)詞。)練習(xí) can even write a little Chinese we ask you some questions now , Mr White ? 39。re quite right , must stop the who would send their children to an unknown young woman ? will not listen to any I return these books to the library ? dare you say I39。m unfair ? 8.“You needn39。t climb the tree , ” his mother news may be true, of it be Susan ?No , it can39。t be has gone to 39。s ten o39。 think she may have gone to : 能力 請(qǐng)求 必須 愿意 必要 可能(表推測(cè))(可能,表推測(cè)), can39。t(不可能,表推測(cè)) 可能(表對(duì)過去事情 的推測(cè)) you explain the sentence again ? _____ hand in your exercise book in at may hand it in on _____ play the piano well when she was quite I clean the classroom before three o39。clock ?No, you needn39。 ____ rain you please show us some photos ? soldier shot his _____ have been tree is ________have given it more _____ be writing their positions in the classroom saw them in the he have finished the work ? I don39。t think : 39。t 1. Where can he ______(be)now ? There’s something important to tell him at . He can’t ________(hear)us because there was terrible noise from the . What he is saying may not _________(be) don’t think she is such a kind of . “ What do you think that noise was ? “ “ It might _______(be)a cat.”5. There must ________(be)something wrong with my you help me to fix it ? 6. The girl must _______(leave)for don’t see her anywhere on the . She ought to ________(have)his was his girl friend at . Haven’t you got the tickets ? You oughtn’t to ________(have)any difficulties in getting . That will ________(be)the usually es at this . Sorry to be so will _____(wait)for some . It should _____(be)somebody never stays in the lab so . She should _______(receive)the sent it five days : heard been left had waited received一、單項(xiàng)選擇 you swim in the river?No, I 39。t not 39。t 39。t I go swimming now? No, you may have a rest 39。t 39。t not 39。t, where is your father?I39。m not in his be visit Lucy on Sunday, Mum?Yes, 。can 。may 。need 。need is Tom?He hasn39。t e to school think he________ be to I go there with you?Yes, you book _____ Lucy39。!Her name is on the book be be 39。t be 39。t be二、填空用所給動(dòng)詞的正確形式填空。(1)Why isn39。t Jim here?He39。s ___________(take)care of his a