高三专项复习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，列举如下： can和could ⑴Can 和 could 可以表示某人或某物一时的特点，表示“客观有可能”可以翻译为“有可能，有时会”。 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。 ⑵can表示能力时，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be able to ，不可以用can。 这种用法的be able to 相当于succeed in 或manage to。 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　could't 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： ①对Were you able to find the pen？做否定回答应该用：No, I couldn't（find it ）.不能说：No, I wasn't able to find it. ②could 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　can't 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。 ③cannot ／can't 与too／over（‐)／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 can't 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 can't 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　。 　 ④ “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 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 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 （固执）？ 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（烟灰缸）. 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 注意：(1)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 。 There must be a day for reveng ... ...