【正文】 （ 5） need作情態(tài)動詞和實義動詞的用法。 （ 3） shall表推測、命令或指示、義務(wù)或規(guī)定、意圖或允諾的用法。 Keys： ， 高考試題對情態(tài)動詞的考查熱點有： （ 1）情態(tài)動詞 must + do表義務(wù)命令等的用法。t 表示沒有必要。t D. shouldn39。t B. mustn39。 （你買了） need作實義動詞后面跟 ing形式，用主動式表被動，相當(dāng)于 need to be done。 Keys： 注意對 need問句的回答 : Need I finish the work today? Yes, ________________. No, ________________. No, ________________. you must you needn’t you don’t have to needn’t 對其它情態(tài)動詞的回答 : Shall I tell John about it? No, you __________. Must we do it now? No, you __________. needn’t (don’t have to) needn’t (don’t have to) ?needn’t +have done表示做了本來不必去做的事。 —Fet it. I was a bit out of control myself。 Keys： ， ， ， 2020上海卷 )29. According to the air traffic rules, you ___ switch off your mobile phone before boarding。 (2) 第 3題 should have done sth表示過去本應(yīng)該做某事卻沒有做。t you be doing C. Couldn39。t D. mustn39。t B. couldn39。s your tour around the North Lake? Is it beautiful? It ________ be, but it is now heavily polluted. [2020 全國卷 I] A. will B. would C. should 2. My cat39。 You should/ought to have told her the truth earlier. She shouldn’t have left without saying a word. 批評 ,意為“本應(yīng)該做到 … 但沒有做到 …”, 用于否定則表示“本不該 … 但” ought to的語氣更強烈 . 情態(tài)動詞： shall, will 的多種意義 : shall / will+ 動詞原形 : * shall 可表示必須、命令、 警告或征詢意見 . * will 可 表示意愿、常出現(xiàn)的動作、在疑問句 中表示請求和建議 . * 均可表示將來。 Young people should learn how to use puters. Every citizen ought to obey law. You ought not to go. 3. should常表示勸告、建議、命令，與 ought to意義相近，但 ought to多表示責(zé)任、義務(wù)，語氣強烈。 It is three o’clock, the football game should begin now. Mary took dancing lessons for years, she should be an excellent dancer. 2. should 的用法 注意： should可表示“居然，竟然”。 4)Shall we begin our class?（征求意見） 5)When shall Mike be able to leave hospital?(請示 ) ，規(guī)定，規(guī)章等文件中，表示一種義務(wù)，多用于第三人稱中。 Keys： 1. D Will /Would you do…? ( 表請求 would 更委婉 ) 表意志，愿望，決心 would表過去反復(fù)發(fā)生得動作或某種傾向 “總是 ,總要” used to表過去常常（現(xiàn)在已沒有這種習(xí)慣） “過去常常” used to 可于狀態(tài)動詞連用 would不可以 eg. He used to be a quiet boy. ( ) He would be a quiet boy. ( ) √ will/would 3. John promised his doctor he ________ not smoke, and he has smoked ever since.[2020北京 ] A. might B. should C. could D. would. 35. But for the help of my English teacher, Ithe first prize in the English Writing Competition[2020福建卷 .] A. would not win B. would not have won C. would win D. would have won D B Shall/should 用于第二、三人稱陳述句中，表示說話人給對方的命令，警告，允諾或威脅。 A. will B. can C. must D. may (四川卷 )10. Although this ____ sound like a simple task, great care is needed。 You __ have lost it while shopping。 May you succeed! May you have a nice trip! May you enjoy happiness in this earthly world! 表示許可 : may / might, can / could * might, could