This point cannot be overemphasized .这一点无论如何强调都不过分 . 注释: ⑴can't ／cannot -too ／enough 等中的not .也可以用never ／hardly ／scarcely 等代替. There can never be too much deception in war .兵不厌诈. We can hardly/scarecely pay too high a price for liberation . 为了解放.我们无论付出多高的代价也不为过. ⑵can't / cannot - -too / enough 等后的附加疑问句的动词用肯定形式can.不用 can't. You can't praise him too much .can you ?你无论怎样赞扬他都不为过.对吧 ? You cannot be too careful ,can you ? 你再小心也不为过.对吧? ⑶“cannot wait 不定式 意思是“be eager to - - 急于做 .表示强调的肯定意思 . I cannot wait to read the book .我非常渴望读这本书 . He couldn ’t wait to see her .他渴望见到她 . 练习题: Please remind your grandpa to take medicine on time.for a man of his age be very forgetful . A．should B.must C.shall D.can ‚You cannot be careful when you drive a car . A.very B.so C.too D.enough ƒThe car broke down on the way ,but we get out of the desert at last. A.might B.would C.were able to D.could2． must有一种含义:“偏要 “硬要 .表示说话人对句子主语所发出的动作或行为是不希望的.不满的甚至是生气的.通常指令人不愉快的事情.must用于第二人称时.常常含有讽刺挖苦的意思: Why must you be so stubborn ? He must come and worry her with questions .just when she was busy cooking the dinner . If you must smoke .at least you could use an ashtray .00 As I was sitting down to lunch .the electric bell must ring . Why must you be so late ?你为何非要这么晚来呢 ? 练习题: Why you always interrupt me ? A .can B .will C .may D. must ‚Naturally .after I told her what to do .my daughter go and do the opposite ! A .may B.can C. must D. should 另:⑴have to 多表示习惯动作或客观条件索引出的义务,而must则用于表示一种重要或急迫的事 情: We have to care for the young . She has to be at the office before 8 every day . You must go to the manager at once .or you 'll be diamissed . ⑵通常have to 强调客观需求.表示因客观环境或事态促使而不得不作某事,must 强调主观看法. 表示主观上认为有必要做谋事. I must learn another language . I have to learn another language .(客观需求:身为一个外交官) 但是must 可以表示客观必然性.意思为“必然(会).总是会 .而have to 则不可以这样用. All men must die .人固有一死. Competition must happen .竞争总会发生. Truth must be out .真相总会大白 . Winter must be followed by spring .冬天到了.春天还会远吗 ? There must be a day for revenge .总有报仇的那一天 . ⑶对must 所在句子变反意疑问句时.应注意以下习惯搭配: ①must 作“必须 解时.反意疑问句中重复must . All the children must respect their parents .mustn’t they ? 孩子必须尊敬父母.对吗? ②must 作“有必要 解时.反意疑问句中用need . We must tell her the truth .needn’t we ?我们现在有必要告诉她实情.对吗? ③“must be 表示推测时.反意疑问句用be 的适当形式 . You must be thirsty .aren’t you ?你一定渴了.是吗 ? ④“must have done 表示推测时 .附加疑问句一般用have 或 has .但是有明确表示过去 的时间壮语时.反意疑问句用过去时态. He must have finished the work .hasn ’t he ? He must have gone abroad last week .didn’t he ? You must have been tould about it that day .weren’t you ? ⑤mustn’t 表示“禁止.不允许 时.反意疑问句一般用may . The children mustn’t play with fire .may they ? 也可以用must . We mustn’t be late .must / may ?我们不可以迟到.对吗? ⑥must 用于表示询问对方意向时.反意疑问句部分的动词可以与前面陈述句部分的动词不一致. You must come tomorrow .will you ? 练习题: You mustn’t tell it to your morther . ? A．must you B．do you C．need you D．will you ‚-----The students must hand in their term papers in a week . ? -----No.they . A．needn’t they .mustn’t B．mustn’t they .mustn’t C．mustn’t they .needn’t D．shouldn’t they .should 【查看更多】
