英語語法情態(tài)動詞及練習題-wenkub
2023-04-19 01:47:42 本頁面
【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引出的問句時，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”的結構表示對現(xiàn)在的推測，它的否定或疑問式用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。相當于“萬一”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結構表示說話人對某事不能理解，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過去常常做某事（現(xiàn)在已不做）當他小的時候他常常5點鐘就起床。如：我寧愿現(xiàn)在什么也不說。 can / can’t 。 should / shouldn’t。 He must have been to Shanghai.2）may / might have +過去分詞，表示對已發(fā)生的事情做不肯定、可能性很小的推測，譯為“過去也許發(fā)生過某事”。表示虛擬語氣1） needn’t have + 過去分詞，表示做了不必做的事，譯為“本沒必要做某事”。如：我本來應該提前仔細地計劃好一切的。 The guests would have arrived by that time/by then.4）could have done, 過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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