情态动词(经典)概要1.pptVIP

8，can’t help doing 情不自禁干.. When I heard the news, I ____________. 情不自禁哭了 9, can’t help (to) do 不能帮助干… I __________________the room,for I am busy. 不能帮助打扫 10, 完全否定推测用can’t be（“不可能”） 肯定推测用must be（“肯定，一定”） He _______Peter. Peter has gone abroad. 11,can 能 be able to do 能(强调成功地做了某事，强调结果不与can 连用 12，can’t be too+形容词= can’t be 形容词+enough 无论…也不要过分 You can’t be too careful. 13,can’t help it . 没办法 5，may\might have done （对过去的猜测） 过去可能已干… Jenny is not in the classroom. She _______________ (go) to the library. 6,当句中有not sure (不确定时）常用may\might 4,（表不满，厌烦）偏偏，偏要 Why must you play the piano at such late night? 5, must：“一定是、准是”只用于肯定猜测 must + be 一定干； must + be doing 一定正干… must + have done (对过去的推测),一定已干.. He __________at home.（一定在家） He __________________.（一定正在工作） The ground is rather wet, so it _________________last night.(一定一下雨） 注意：must表猜测时，其反意疑问句的构成如下： must + be, 反意部分用 be (not) +主语 must + be doing ,反意部分用 be (not) +主语 must + have done（无过去时状）反意部分用 have\has (not) +主语 must + have done（有过去时状）反意部分用 did (not) +主语 He must be in the classroom, ______he? He must have seen the film, ________he? He must have seen the film last month, _______he? must 侧重于说话者的主观看法，认为有必要或有义务去做某事； have\has to 则重于表示外界客观需要，含有不得不或被迫之意 have\has to 有人称和时态的变化,变一般疑问句，否定句借助于 do ,does,did I have to go. He has to go. We had to go. 一般疑问句，及肯否定回答 need: 需要 1，作情态动词 need+动原 一般疑问句用Yes,.must\no,.needn’t He need make a plan. 2， 作实意动词（有人称和数变化，need to do He needs to make a plan. 3，主语+ need to do（主语能发出do 的动作） He needs to make a plan. 4，主语+ need +doing\to be done （主语不能发出do 的动作，主表被） The old man _____________________________.(照顾 . 4,用于虚拟语气中:在if引导的条件状语从句中，若从句有should,可以省略if将should提前。 If it should rain ,I would stay at home. ______ it rain ,I would stay at home. 5,should/ought to have done “本应该”（没干） 6,should not/ ought not to have done：“本不该……”（干了） 28. I told Sally how to get here, but perhaps I ______ for her. (94) had to write it out B. m