情态动词精华版总结.ppt
情态动词-体,1.情态词+do2.情态词+be doing3.情态词+have done4.情态词+have been doing,现在，将来,此刻正,已经，过去,一直在,1.That old man must be seventy now.2.He must be waiting for us.Lets hurry.3.Its already 7 oclock now.Tim must have gone home.4.Theyre sweating all over.They must have been working in the field.,情态动词-可能，推断,肯定句mightmaycouldcanshouldought towouldwillmust否定句might notmay notcouldntcant疑问句Might/Could/Can?,1.You might have some fever.2.There may be a flight this evening.Let me check.3.Mr.Smith is in poor health.He can be ill at any moment.4.Its seven oclock now.He should be here at any moment.5.Look,the light in his room is on.He must be at home.,情态动词-可能，推断,6.This will be the house youre looking for.7.He might/may not be here.8.He couldnt/cant be over fifty.9.Might/Could/Can this be true?10.Might/Could/Can he have been waiting long?11.Can this be true?12.Where could/can they be now?句型：Can it possibly rain tonight?,情态动词-Can与May,Can表示理论上，常理上的可能。从一般道理推断。May表示事实上的可能。从实际情况推断。比较：1.(A)The pound can be devalued.(B)The pound may be devalued.2.(A)Mr.Smith looks pale.He may be ill.(B)Mr.Smith is in poor health.He can be ill anytime.,情态动词-Shall与Will,1.征求意见:Shall I/we/he/they?Will you?2.Shall 用于第二,三人称,表示说话者的“警告”,“允诺”,“命令”,“决心”.3.Will表意愿“愿意”.1.Shall I fetch a doctor for you?2.Shall he attend the meeting?3.Will you be quiet,please?4.You shall have a nice cake if you listen to me.5.You shall be sorry for what you have done,I tell you.6.When he comes in,nobody shall say a word.,情态动词-Shall与Will,7.Nothing shall stop us from carrying out this plan.8.He can join us if he will.,情态动词-Could与Was/Were able to,Was/Were able to 表示过去成功做得 I was able to beat him at tennis yesterday though he was a really good player.,情态动词-Would与Used to,Used to 表示“今昔对比”Would 表示“过去倾向”，不与状态动词连用。1.There used to be a hospital here.2.I used to drink black tea,but now I drink green tea.3.In those days,he would/used to come and visit me on Sundays.,情态动词-注意事项,征求许可May/Might I?(仅用于第一人称)Could/Would you?(回答不用could,would)neednt have done 没必要做,(但做了)didnt need to do 没必要做,(还没做)-Well,I forgot to bring my dictionary here yesterday.-Actually you _ it here.You were not allowed to use it.A.neednt have brought B.didnt need to bring,情态动词-注意事项,should/ought to have done 应当做(但没做)shouldnt/oughtnt to have done 不应当做(但做了)1.You should(ought to)have waited for us.2.She shouldnt(oughtnt to)have let the baby play with the scissors.May 表祝愿,用于祈使句.1.May we never forget each other.2.May you return in safety.,情态动词-注意事项,cannottoo/enough 无论怎样也不为过,越越好1.You cannot be too careful when crossing the street.2.You cannot remember enough English words.Will 表示经常发生（shows what always happen)1.Accidents will happen.2.Oil will float on water.3.He will ask silly questions.,
