当前位置:首页 >> 英语 >>

情态动词


情态动词
一. 情态动词的概述 情态动词表示说话人的语气和情态,如需要,可能,允许,愿意等,有一定 词义, 但不完整, 必须和动词原形一起构成谓语。 常用情态动词有: can , could , may , might , must , will , would , shall , should , need , have to , had better . 二. 情态

动词的特征。 1.情态动词不能单独作谓语,后接动词原形一起构成谓语。 He may be the most beautiful girl in our school . 2.情态动词除 have to 外,没有人称与数的变化。 I can swim well . He can swim well . we must work hard . He must work hard . I have to walk to school . He has to walk to school . He can swim well .

3.情态动词一般有现在时和过去时两种,除 must 外 can----could need----needed may----might will----would shall----should

have to----had to 但这些过去式并不都代表过去, 有的只表

示委婉的语气, 如:Could you tell me where the restrooms are ? / Could I use your car ? Would / Will you please open the door ? / You might be right .

4.情态动词的的否定句式,疑问句式 情态动词起助动词的作用,否定句式直接在情态动词后加 not , 疑问句式将 情 态 动 词 提 前 , can----can’t must----mustn’t should---shouldn’t could----couldn’t might----mightn’t may----mayn’t will----won’t

would---- wouldn’t need---- needn’t ,但 have to 除外, 它的否定句式和疑问句 式要借助 don’t have to , doesn’t have to , didn’t have to ,do , does , did . 三.情态动词的用法

can 和 could 的用法 (一) . ①表能力, could 是 can 的过去式, 如: My mother can use the computer now , but she could not use it three years ago . ②表请求, can 和 could 没有时

间上的差别,只是 could 的语气较委婉客气些,但回答时均用 can 回答,如: ---Could I borrow your pen ? ----Yes , you can / Of course / sure ③表许可,Can I go now ? / ----Sorry /

No , you can’t / I am afraid not .

④表推测,后可

用进行时或完成时,多用于疑问句和否定句中,用于疑问句中(can)表“可 能” , 用于否定句中 (can’t) 表十分否定的推测 “不可能” , 如: Who can the man under the tree be ? / The boy can’t be Jim. He has gone to China and hasn’t

come back . He can’t be reading books , he doesn’t like studying at all . / He can’t have gone there alone . (二). can 和 be able to 的用法比较 ① 表能力时,两者同义,如:I can play the guitar = I am able to play the guitar . / He can swim = He is able to swim . ② can 只有现在时和过去时两种时态, 但 be able to 适用于各种时态,除了现在时和过去时,还可用于将来时,完成 时等, 如: He will be able to tell you the news soon . my party ? Will you be able to come to

He hasn’t been able to finish his work in time .

must 和 have to 的用法 (一). ① 表必须时,must 表说话人的主观看法;have to 表客观需求,如:I don’t want to stay here any longer , I must leave now . / It is too late , I have to leave now . I am really tired , but there are no buses now ,I have to walk to school . ② must 只有现在时,而 have to 有过去时或将来时 (二). have to 的疑问句式和否定句式通常借助 do , does , did 来完成, 如:I

have to leave now . ----- Do you have to leave now ? ----- I don’t have to leave now . He had to walk to school yesterday .----- Did he have to walk to school

yesterday ? -----He didn’t have to walk to school yesterday . (三). ① must 的否定形式及答语,如:----Must I finish my homework now ? -----Yes , you must / No , you needn’t ( don’t have to ) . ② must 的否定形式 must not = mustn’t ,表“不准,不许可,禁止,千万不” , 如:You mustn’t play soccer on the street , it is too dangerous . / Look at the sign “NO smoking” , you mustn’t smoke here . (四).表十分肯定的推测 , 十分否定的推测用 can’t , 对现在的推测 对过去的推测 对现在正在 进行的推测 对将来正在进 行的推测 如:The book must belong to Jim , it has his name on it . / the light is on . / It must have rained last night . / need 的用法 (一).① need 作情态动词主要用于否定句(needn’t)和疑问句,后接动词原 形, 没有人称, 数和时态的变化 , 如: I need not finish my homework now . / Need I finish my homework now ? ② need 的疑问句式的答语肯定回答用 She must be at home , must + be + doing must + must + must + do

have + done be + doing

It must be raining outside .

must , 否定回答用 needn’t 或 don’t have to , 如: -----Need I finish my homework now ? ---- Yes , you must / No , you needn’t/don’t have to .

(二). need 作实义动词有人称,数和时态的变化 ,其否定句式和疑问句式分 别借助 don’t need to , doesn’t need to , didn’t need to , do , does , did , 使用结构 有:need to do sth , need sth , need doing sth ( need to be done ) , 如:He needs to finish his homework first . ----He doesn’t need to finish his homework first . ---Does he need to finish his homework first ? ---- Yes , he does / No , he doesn’t . / He is too thirsty , he needs a cup of tea . / The bike needs repairing = The bike needs to be repaired . may 和 might 的用法 ① 表 “许可 ” , 有 “可以” 的意思, 可与 can 互换, 如: You can / may go now . / May / Can I use your car ? ② 回答 may 开头的疑问句式时, 肯定回答用

yes ,

you may / can , 否定回答用 No , you mustn’t / you can’t 或 No , you had

better not , 如:-----May I spoke here ? ----- Yes , you may / can / No , you mustn’t / you had better not . ③ 用于祈使句中表祝愿, 如: May we never forget each other . ④ 表推测,might 的可能性比 may 更小些 ,might 的语气比

may 更委婉些 ,如:He may come to my party ,but I am not sure . shall 和 should 的用法 ① shall 用于第一人称 ,表将来的动作 ,如:What shall we do this evening ? / We shall go to the zoo this Sunday . ② shall 用于第一人称疑问句中 ,表征求对方意见,提建议或向对方请示 , 如:Shall we go to the park this night ? / Shall we begin our class ? will 和 would 的用法 用于疑问句中表请求或征求意见 , 如:Will you give me a piece of paper ? / Would you please open the door ? / Would you mind my opening here ?


相关文章:
情态动词may 的用法
用 may 表示可能性 解析:may 是情态动词,在句中不能单独作谓语,后面需接动词原型。 Mary may know the answer to the question. 拓展:A. must, can 和 ...
情态动词
情态动词_英语_高中教育_教育专区。情态动词 (常见的情态动词:can; must; may; should; could; might; had better; ought to; have to) 考点 1:情态动词...
情态动词特殊用法大集合
情态动词特殊用法大集合 情态动词除了基本的用法以外还有许多特殊之处, 最基本的用法读者可以结合自己的语法书 籍来适当复习,这儿就不赘述,主要略列一些特殊用法,...
情态动词用法及区别
情态动词用法及区别 (一)、情态动词 can、could、may 情态动词是表示说话人的某种感情或语气的动词, 用来表示请求、 允诺、 愿望、 建议、 命令、 能力、需求或...
情态动词归纳总结
情态动词归纳总结_英语_高中教育_教育专区。情态动词归纳总结一.概念 表示说话人对所说动作的观点,如需要、可能、意愿、怀疑等。在形式上,情态动词一般没 有人称和...
情态动词should的讲解
情态动词 should 一:用来表示现在或者将来的责任、义务,译为应该、应当,在此情况下可与 ought to,be supposed to 互换使用。 例如:You should complete your ...
情态动词知识结构图
情态动词知识结构图_英语_高中教育_教育专区。情态动词 用法 表示能力,意为“能、会” I can play the guitar. I can’t play the violin. 举例 Can 表示...
情态动词must用法详解
情态动词 must 用法详解 (1) 表示“必须” 此时可用于肯定句、否定句或疑问句,用于否定句时,mustn’t 的意思是“一定不要”“不能”, 而不表示“不必”。如...
情态动词重难点
情态动词重难点 1.may,表示请求,许可,比 can 正式 (2)表示推测,谈论可能性 (3) may 的过去式为 might, might 也可以表示可能性低于 may (此时 might 没有...
分析情态动词和助动词的区别
分析情态动词和助动词的区别_英语学习_外语学习_教育专区。分析情态动词和助动词的区别 情态动词是一种本身有一定的词义,但要与普通动词一起使用, 给谓语动词增添...
更多相关标签:
情态动词的用法 | 情态动词有哪些 | 情态动词练习题 | 助动词 | 失态 | 情态动词ppt | 情态动词can的用法 | remind |