高中英语《情态动词》.ppt

情态动词;情态动词有一定的意义，但没有人称和数的变化，不能独立使用，它和后面的动词构成谓语． 只作情态动词的　　can/could, may/might, 　　　　　　　 　ought to， must 可情态可实义的　　need, dare/dared 可情态可助动词的　shall/should, will/would 相当于情态动词的　have to, used to ;Must , can/could, may/might 的用法;2.Must +be doing/do 表示对现在的动作进行肯定推测 ;3.Must +have done 表示对过去发生的事情作出的肯定判断;can/could ;2. can/could have done 对过去发生行为的可能性进行推测:;3. can/could have done “本可以，本来可能已经”用于肯定句中，表示对过去发生的事情做出的判断， ;他们可能还在等我们呢。;3.might/may have done,表示对过去发生的动作进行可能性推测， ;Will /Would you do…? 表请求 表意志，愿望，决心 would表过去反复发生得动作或某种倾向 “总是,总要” used to表过去常常（现在已没有这种习惯） “过去常常” used to 可于状态动词连用　would不可以 eg. He used to be a quiet boy. (　　) He would be a quiet boy. (　　 ) ;1. ---- Will you go skating with me this winter vacation? ---- It ___ . ( 2002上海) all depended B. all depends C. is all depended D. is all depending;2. I failed in the final examination last term and only then _____ the importance of studies.( 2004重庆 )A. I realized B. I had realizedC. had I realized D. did I realize;3. ---- I would never come to this restaurant again. The food is terrible! ---- _______ . ( 2004全国 ) A. Nor am I B. Neither would I C. Same with me D. So do I;When you are very sure of something, you use must in positive sentences and cannot or can’t in negative sentences.;When you think that something is possible, but you are not very sure, you use could, may or might.;Practice 2:表示推测——情态动词的重要用法.;表示推测——情态动词的重要用法.; 1. I dont know where she is, she _______ be in Wuhan. 2. At this moment, our teacher ________________ our exam papers. 这时，我们老师想必在批改试卷。 3. The road is wet. It ________________ last night. (rain) 4. Your mother ______________________ for you. 　你妈妈一定一直在找你。 ;5. Philip ________________________ seriously in the car accident. 菲利普可能在车祸中受了重伤. 6. ---Linda has gone to work, but her bicycle is still here. 　---She _____________________ (go) by bus. 7. Mike _______