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1、情态动词归纳表情态V词义&用法注意事项特殊用法can could1.表具备某种能力Can表现在能力；Could表示过去能力. 可用 be able to 代替； was/were able to to 表示成功做了某事（1）表惊异、怀疑、不相信、不耐烦等。 （此意常用于否定句、疑问句或惊叹句语气）Can/Could this be true?（2）can no t tooe no ugh 表示无论怎 样也不过分,越越好:You cant be too careful.2.表请求和允许 请求用could语气委婉 允许不用could.3.表“可能性” can用于否定和疑问句（could不限） ca
2、n （be）表示有时候会（常与 sometimes, at times 连用）may might1.表请求和允许 请求用might语气更委婉。 允许时用 may，表示“可以”（表示 允许时不用 might）。（1）may/might well+V 原形：表”完全 可能,很可能=be very likely to:He may well be proud for his son.（2）may/might as well+V 原形：”最好， 满可以，倒不如”You may as well stay here over ni ght.2.表可能性“也许”此意常用于肯定句。（might可能最小）3表祝
3、愿固定句型为“ May+主语+V原型”：May you succeed!must1.表“必须” must多表主观、现在/将来义务； have to多表客观、过去义务 must nt表”禁止”；否定用 need nt / dont have to（1）表小必然结果：All men must die.人固有一死。（2） 表示一种与说话人愿望相反、不耐 烦的感情色彩，可译为“一定要、偏偏、 非要”：If you must know, her n ame is Mary.2.表推测：“肯定 是、准是”只用于肯定句。在否定句/疑问句中用can/couldwill would1.表意愿,决心等Would此
4、时为will过去式，无意义差别（1）will表命令（说话者确定命令一定会得到执行）或允诺：You will report tome afterwards.（命 令）They will get eno ugh money from me.（允诺）（2） 可用于祈使句附加疑问句（反义疑 冋句）：（此时would比will委婉）Don tgo now, will you?（3）would 短语：would rather/would prefer 宁愿； would like/would love 喜欢 / 想要2.表经常性，习惯 性，倾向性，Would表过去反复的动作/某种倾向（相 对于used t
5、o无“现已无此习惯”之义。）3.表功能，性质叙述真理：The tree will leave withoutwater for 3 mon ths.4.表估计：“想必， 大概”（只时态区 另U）此意表对目前事物的预料。That will bethe postman ringing.（would 表示过去 /现 在；will表示现在/将来）5.（表请求/要求Will you ?）此意用于疑问句，常与you连用 Will you give me a piece of paper?shall /shant1.表征求意见（“好 不好”）用在第一、二人称 Shall the reporters wait
6、 outside or what?其他示例：He shall have the book whe n 1 finish readi ng.（允诺）You shall fail if you dont work harder.（警 告）You shall come at once.（命令）2.表允诺、威胁、 警告、命令或根据 规定有义务做用于第一、第二人称Passengers shall not talk with the driver while the bus is movi ng3.表规章、法令、 预言：“必须”用于所有人称Every competitor shall wear a nu
7、mber1.表示道乂上的责 任，义务或要求，有时表示劝告：You ought to /should paymore atte nti on to what your lawyer says.（1）should用于疑冋句中 表示说话人 对某事不能理解，惋惜，感到意外，赞叹，愤怒、惊异等感情，意为“竟会”,有时也用于陈述句中（2）Should还可以用在if引导的条件 从句，表示一件事听起来可能性很小， 但也不是完全没有可能，相当于“万一” 的意思。（见注意）should ought to2.表示推测和可能 性，是“（按理说） 应该之意肯定的语气没有 must用于推测时强This pen ought
8、 to /should be yours.3.表示说话人的一 种谦逊，客气，委 婉的语气此意常用于第一人称时：You are mistake n ,1 should say .（依我看你是搞错了 ）注：情态动词在表推测的肯定程度是不一样的。按最有把握到最没把握排列，这几个词的顺序是； mustwill would should can could may might【情态动词（Modal Verbs ）】情态动词也可称为情态助动词(Modal Auxiliaries) ”，因为它和基本助动词 (be, do, have)都属于助动词类。*情态动词和其他动词连用，可表示说话人的语气。*情态动词可
9、表达建议、要求、可能和意愿等。*情态动词没有人称和数的变化。* 常用的情态动词有：can, could, may, might, must, shall, should, will, would 这九大情态动 词；其他的还有 ought to, need, dare等。*时态部分：be表示对现在的推测have done表示对过去的推测be doing表示对正在进行的推测中考考点情态动词练习1. -Mum， may I watch TV now? -Sure, but youhelp me with my English.A. canB. mayC. must D. could2. -I dow
10、 nl oad the article aga in?-No, you n eed nt.A. ShallB. WillC. Must D. Can3. -Ca n you go skati ng with us this after noon?-Sorry, I cant. Itake care of my little sister at home.A. canB. mayC. would D. have to4. -Must I hand in my exercise book today? -No， you.A. cantB. need ntC. must ntD. wont5. -M
11、ay I have a word with you? -No, you. Im busy today.A. need ntB. would ntC. dont have to D. cantI have your En glish n ame, please? -Yes, Hele n. H-E-L-E-N. B. May7. -Who is the boy over there?6.-A. MustC. WillD. NeedA. must ntB. may notIs it Joh n?C. cant-No, itD. need ntbe him. Joh n is much taller
12、.-Yes, IC. need.Its easy.D. may8. -Ca n you play Frisbee, Jay?A. must B. can9. -You must come back every mon th. -Yes, I _D. canA. will B. mustC. should10. Sheknow the an swer, but rm not sure.A. maybe B. may beC. mayD. must11. - Must we clean the room right now? - No， you. You clean it after lunch.
13、A. neednt ； mayB. neednt; mustC. Must nt ； canD. must nt ； may12. Johncome to see us toni ght, but he isnt very sure yet.A. may B. canC. has to D. must13. Childre nplay with fire.A. must ntB. cantC. should ntD. need nt14. -I come in, Mr. Gree n?-Yes, come in， please.A. Must B. NeedC. WillD. May15. -Must I finish the work today? -No, you. Youfinish it tomorrow.A. must nt ； mayB. cant; canC. n eed nt;mayD. n eed nt ； must
