神志动词的用法(一)[精品].pptVIP

情态动词的用法（一）;;另外：;④could 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。;注意： 　⑴cant ／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。 ⑵cant / 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？ 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 。; ?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