英語(yǔ)語(yǔ)法情態(tài)動(dòng)詞及練習(xí)題-wenkub
2023-04-19 01:47:42 本頁(yè)面
【正文】 2. may和might的用法1)表示許可。2) 用于祈使句中表示祝愿。如：You must e in time.回答must引出的問(wèn)句時(shí)，如果是否定的回答，不能用mustn39?！?Must we hand in our exercise books today?— Yes, you must. No, you don’t have to/needn’t.2) “must be + 表語(yǔ)”的結(jié)構(gòu)表示對(duì)現(xiàn)在的推測(cè)，它的否定或疑問(wèn)式用can代替must。 This must be your pen.3) have to的含義與must相似，兩者往往可以互換使用，但have to有各種形式，隨have的變化而定。③ 二者的否定意義不大相同。t have to go. 你不必去。m unfair. He daren39。如：You shall fail if you don39。③ I should advise you not to do that. 我倒是勸你別這樣做。相當(dāng)于“萬(wàn)一”的意思。 If you should change your mind, please let us know. ⑦ Should I (If I should) be free tomorrow I will e. 此外，Why(or How) + should結(jié)構(gòu)表示說(shuō)話人對(duì)某事不能理解，感到意外、驚異等意思。t know why you should think that I did it.7. will和would的用法1）表示請(qǐng)求、建議等，would比will委婉客氣。如：You ought to take care of him. He ought to be home by now. 9. used to，had better，would rather的用法1）used to do過(guò)去常常做某事（現(xiàn)在已不做）當(dāng)他小的時(shí)候他常常5點(diǎn)鐘就起床。如：我寧愿現(xiàn)在什么也不說(shuō)。 can / can’t 。 should / shouldn’t。 He must have been to Shanghai.2）may / might have +過(guò)去分詞，表示對(duì)已發(fā)生的事情做不肯定、可能性很小的推測(cè)，譯為“過(guò)去也許發(fā)生過(guò)某事”。表示虛擬語(yǔ)氣1） needn’t have + 過(guò)去分詞，表示做了不必做的事，譯為“本沒(méi)必要做某事”。如：我本來(lái)應(yīng)該提前仔細(xì)地計(jì)劃好一切的。 The guests would have arrived by that time/by then.4）could have done, 過(guò)去本可能做某事但未做。 Without your help, I couldn’t have succeeded. 例題1. As it turned out to be a small house party, we ______so formally. A. needn’t dress up B. did not need have dressed upC. did not need dress up D. needn’t have dressed up例題2. Mary_____ my letter。 it ____cleaned. (CET4)A) can39。t have been4. Nobody knows how people first came to these islands. They ____ from South America on rafts.A) must have sailed B) can sailC) might have sailed D) should have sailed was not in her bedroom yesterday afternoon. She ____ in her classroom.A) should have been B) must have beenC)
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