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10 情态动词 英语语法课件 老师用DAVID西安市昆仑中学


一、概述 二、CAN 三、MAY 四、MUST 七、SHALL 九、WILL 十一、DARE 注意问题

COULD MIGHT

SHOULD WOULD NEED

概述
1、情态动词没有人称,数的变化 He can do it. I can do it. They can do it. You can

do it. 2、情态动词后面只能接不带to 的不定式

CAN的用法
(一)表能力(ability) 1、会用于表示身体或精神上的能力 I can run faster than you. Can you remember the war? 2、用于表示具有某种能力或技能 I can tune the piano as well as play it. Can you cook?

3、与感官动词连用 I can hear music. I thought I could smell something burning. 4、表示拥有某种特殊权力、权利或特权 The President can veto congressional bills.

(二)表许可(permission) Can I read your newspaper? Can I take you home? We can’t wear jeans at work. You can take the car if you want. Can I help you?

(三)表示可能性(possibility) That can’t be Mary – she’s in hospital. There’s someone outside. Who can it be? Where can she have put it? He can’t be serious. (四)提出建议 We can eat in a restaurant, if you like.

MAY的用法
(一)表许可(permission) You may come if you wish. May I come in? Passengers may cross by the footbridge.

(二)表现在或将来的可能性 (possibility) This coat may be Peter’s. That may or may not be true. This medicine may cure your cough. (三)表目的 I’ll write today so that he may know when to expect us. He got up early in order that he may get to school on time.

(四)表祝愿 May you both be very happy! Long may she live to enjoy her good fortune!

MUST的用法
(一)必须,一定 1、为道德良心、法律或者习惯所要求或 强迫 Citizens must register in order to vote. 2、由于物质需要和要求而被迫: Plants must have oxygen in order to live.

3、表示命令或者愿望 You must not go there alone 4、一定下决心一定要;坚持要 If you must leave, do it quietly. (二)一定(possibility) He must be here – I have just seen him. He must be asleep – the lights are off.

(三)偏要,偏偏(表示与说话人愿 望相反及不耐烦) Why must it rain on Sunday? Just as I was sitting down to supper, the telephone must ring. Why must you? I can never expect it.

COULD的用法
(一)can的过去式 (二)表许可(较can委婉) (三)能, 可能, 可以(表示比较 小的可能性,小于may)

MIGHT的用法
(一)may的过去式 (二)表许可(较may委婉) (三)能, 可能, 可以(表示比较 小的可能性,小于may)

SHALL的用法
(一)应该(例如命令、承诺、要求 或义务) You shall leave now. He shall answer for his misdeeds. The penalty shall not exceed two years in prison.

(二)会做(使某事发生的愿望) I shall go out if I feel like it. (三)一定(不可避免) That day shall come. (四)建议(同第一人称连用) Shall I drive? Shall we take out swim-suits?

SHOULD的用法
(一)应该(用来表示义务或职责) You should send her a note. (二)应该(用于表示可能性或期望) They should arrive at noon. (三)万一(用于虚拟语气) If she should fall, then so would I.

WILL的用法
(一)愿(用于表示意愿或请求) Will you help me with this package? (二)必须,一定(用于表示要求或命令) You will report to me afterward. (三)经常,惯于,总是(用于表示经常 性或习惯性的动作) People will talk. Fish will die without water.

WOULD的用法
(一)will的过去式 (二)愿(用于表示意愿或请求,比 will更委婉) I wish you would stay. Would you go with me?

DARE的用法
(一)情态动词 Let him say that if he dare. Dare we tell her the truth? I dare not mention their names. If you dare breathe a word about it I'll never speak to you again (I dare say …)

(二)实义动词 1、He will dare any danger. 2、Does she dare to go alone? 3、He dared me to jump over the stream.

NEED的用法
(一)情态动词 You need not finish that work today. Need you go there yourself? Nodody need be afraid of catching the disease. He is wondering whether he need send for a doctor.

(二)实义动词 1、I need a English-Chinese dictionary. 2、 Does he need to go so soon? 3、The garden dosen’t need watering twice a day.





(一)情态动词表推测的用法 1、can在肯定句表理论上的推测 Harbin can be very hot in summer. 2、could只能用于肯定句 3、can’t用于对一次具体事实的推测 4、may, might, could表较小的可能性 5、may not, might not表示“可能不”

6、在疑问句中表推测只能用can 7、对过去的推测一般用“情态动词+ 动词的完成式” 8、could have done本来可能做 couldn’t have done本来不可能做 should have done本来应该做 shouldn’t have done本来不应该做 needn’t have done本来没必要做

(二)would, should, could, might可 用于虚拟语气 (三)don’t have to, don’t need to表 “不必” (四)can与be able to的区别 (五)should与ought to的区别 (六)may/might as well不妨 If that is the case, we might as well try.

(七)have to和must的区别 (八)had better表示“最好” (had better have done sth表示 与事实相反的结果,意为“本 来最好”。 You had better have come earlier. (九)would rather, would sooner, had rather, had sooner 表示“宁愿”

(十)与人称的连用 1、Will you …/Would you …用于请求 2、Shall I …/Shall we …用于请求 3、May I …/Might we …用于请求许可 4、 Can I …用于请求许可 5、Yes, you can一般用于回答请求

(十一)would like to have done sth表示 本打算做某事,但没做 I would like to have read the article, but I was very busy then.


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