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1、八年级下册英语语法情态动词1 定义：情态动词是一种本身有一定的词义,表示说话人的情绪,态度或语气的动词,但不能单独作谓语, 只能和其他动词原形构成谓语，常见的情态动词有can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would) .2 情态动词的特点: 情态动词无人称和数的变化, 情态动词后面跟的动词需用原形,否定式构成是在情态动词后面加not 。 个别情态动词有现在式和过去式两种形式, 过去式用来表达更加客气, 委婉的语气 , 时态性不强 , 可用于过去， 现在或将来。3
2、情态动词的用法: can (could) 表示说话人能,可以 ,同意 ,准许 ,以及客观条件许可 could 为 can 的过去式。Must 必须 ,应该 ,一定 ,准是 , 表示说话人认为有必要做某事, 命令 , 要求别人做某事以及对事物的推测。must 用来指一般现在时和一般将来时, 过去式可用have to 的过去式代替。must + have + 过去分词 ,表示现在对过去事物的推测。must 和have to 的区别 : must 表示说话人的主观思想, have to 表示客观需要。need 是一个情态动词, 他的用法完全和其他情态动词一样, 但 need 还可当作实义动词使用,
3、这时need 就象其他动词一样,有第三人称 ,单复数 , 后面加名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 4 页 - - - - - - - - - 带 to 的动词等特性。neednt + have + 过去分词表示过去做了没必要做的事情。dare 除用作情态动词外,更多的是当实义动词使用, 用法同实义动词一样,要考虑人称 ,单复数 ,时态等。ought 应当 ,应该后面跟带有to 的动词不定式。ought + to have done 句型。指过去动作 ,表示一
4、件事情该做而未做。 ought not to have done 句型。表示一件不该做的事情却做了。will (would) 决心 ,愿望。would 为 will 的过去式 , will, would 用于疑问句表示说话人向对方提出请求或询问,用would 比 will 更婉转 ,客气。Shall, should 表示命令 ,警告 ,允诺 ,征求 ,劝告 ,建议惊奇。have to,不得不 ,必须,表示客观条件只能如此 , 而 must 则表示主观思想必须中考习题练习1. I m sorry. I _ go now. My father told me on the phone that m
5、y mother was ill. A. can B. may C. have to D. think 2. “Wheres my umbrella?” “It s fine today. You _ take an umbrella with you.” A. can t B. neednt C. mustnt D. shouldnt 3. -I don t mind telling you what I know. -You _. I m notasking you for it.A. neednt B. mustnt C. may not D. cant 4. We hope that
6、as many people as possible _ join us for the 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 4 页 - - - - - - - - - charity show tomorrow.A. need B. can C. must D. should 5. -_ your friend play the guitar? -Yes, he can, but he cant play it well.A. Must B. Can C.
7、Should D. Need 6. -Is Mr. Brown driving here? -I m not sure. He _ come by train.A. may B. shall C. need D. must 7. -May I put my bike here? -No, you _. You should put it over there.A. couldnt B. neednt C. mustnt D. wont 8. The baby is too young. You _ give her big pieces of food.A. may B. must C. ma
8、y not D. must not 9. Tony _ go to the opera on Saturday because hes going to have a meeting.A. can t B. might C. mustnt D. should 10. -Tom, dont drive too fast, you _ hit the others cars. -Ok, I won t, Mum.A. must B. need C. may D. have to 11. -Must I do the work now? -No, you _. You may do it later
9、.A. can t B. mustnt C. neednt D. shouldnt 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页，共 4 页 - - - - - - - - - 12. Im sure this book _ Li Leis, because there is his name on it.A. can t be B. may be C. might be D. must be 13. -Listen! Is Professor Bloom giving a
10、 speech in class? -No, it _ be him. He has gone to France.A. may not B. mustnt C. neednt D. cant 14. -Who s that boy reading in the garden? Is that David? -It _ be David. I saw him in the classroom just now.A. must B. cant C. may D. shouldnt 15. -Will you answer the telephone? It _ be your mother. -Sorry. I _. Im busy.A. can; mustnt B. may; wont C. may; cant D. need; will 16. Four hundred dollars for a pair of shoes, you _ be joking! A. may B. can C. need D. must名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共 4 页 - - - - - - - - -