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情态动词的用法(一),can /could 在英语中的特殊用法,一、can/could 可表示某人或某物一时的情况,可以翻译为“有时会,可能会”;,It can be very warm in this area 。这个地区有时可能非常暖和.,He can be very friendly at times 。他有时会非常友好。,二、can表示能力时(即有某种知识和技能而能办到),可以与be able to 换用。但是在将来时和完成时中 必须用be able to ;表示经过努力而成功地办到了某个具体的事情时,只能用was/were able to ,不可以用could。这种用法的be able to 相当于succeed in 或manage to。另外:can not 比 cannot 的强调意味更强 。,Can you type ? Are you able to type ? I am sure we shall be able to get you a job soon 。(不能用can) He has been able to finish the work on time 。(不可用can) After years of hard work he was able to win the prize 。(不可以用could) He couldnt climb the mountain 。(没有能力爬,因而也没有爬) He was not able to climb the mountain 。(尝试爬过,但是没能爬上去),另外:,be able to 强调能力,通常表示一次性的事件,一般不表示经常性的事件。,I was able to pass the examination 。(I succeeded in passing the examination 。) 我能考试及格。(考试及格了) After studying that you will be able to solve these mathematics problems 。 学习完这个方法后,你能够解这些数学题了。,在否定句结构中,be able to 指暂时的情况,而can可以指经常的情况。,He is not able to swim today 。他今天不能游泳。 He cant swim at all 。他根本不会游泳。 I shall not be able to go to school tomorrow 。我明天不能上学了。,在表示“经过尝试或努力为能做到”的意思时,一般不用be able to。 如对Were you able to find the pen?做否定回答应该用:No,I couldnt (find it )。不能说:No ,I wasnt able to find it 。,could 可以用来表示过去习惯性动作的完成,而was able to 却没有这种用法。,I could run after a bus and catch it twenty years ago ,I cant do that now 。 二十年前,我能在后面跑着追上公共汽车,现在不行了。,cannot cant 与tooover()enough perfectly sufficiently 等词连用,意思是 “越越”“无论怎样 也不为过”、“决不会 够(过)”。,You cant praise him too much 。你无论怎样称赞他都不过分。 You cannot be over careful 。你越细心越好。 I cant thank you enough 。我对你感激不尽。 This point cannot be overemphasized 。这一点无论如何强调都不过分 。,注意: cant 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/scarcely 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。 cant / cannot too / enough 等后的附加疑问句的动词用肯定形式can,不用 cant。 You cant 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? “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 。,Please remind your grandpa to take medicine on time,for a man of his age _be very forgetful 。 Ashould B。must C。shall D。can You cannot be _careful when you drive a car . A. very B. so C. too D. enough The car broke down on the way ,but we _get out of the desert at last. A. might B. would C. were able to D. could,练一练吧,D,C,C,
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