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  call 

  [误] I‘ll call at Mr Brown.

  [正] I‘ll call on Mr Brown.

  [误] I‘ll call on Mr Brown‘s home.

  [正] I‘ll call at Mr Brown‘s home.

  [析] 作"拜访"讲时,at后面接访问地点,而on后面接访问的人。

   call on drop in visit 

  call on比较正式的为公务的访问,如:We were called on by the old students. 而drop in则是比较随便的走走,顺便拜访,如:If you‘re free, drop in. 而visit则是更正式的外交访问或友好往来,如:My school‘s headmaster will visit America next week.

  can 

  [误] A blind man can not judge colours.

  [正] A blind man cannot judge colours.

  [误] I cann‘t call for you at ten.

  [正] I can‘t call for you at ten.

  [析] can的否定形式应为cannot或can‘t.

  [误] It‘s only six o‘clock. That mustn‘t be the postman.

  [正] It‘s only six o‘clock. That can‘t be the postman.

  [析] must用来表示一种肯定的推断,如:She must have some problems. She keeps crying. 但在否定句中则要用can‘t, 要表示对过去的推测则要用"must+have+过去分词"的表达法,如:The lights have gone out.A fuse must have blown.而对过去的否定推测则多用"can‘t+have+过去分词",如:I don‘t think he can have heard you. Call again.

  [误] We could not help to laugh at once.

  [正] We could not help laughing at once.

  [正] We could not help but laugh at once.

  [析] "couldn‘t help+动名词"表示禁不住做了某事。但could not help but与could not but后面要加不带to的不定式,意思都是不得不去做某事.如:You could not (help) but respect him.

  can be able to 

  can与be able to都可以用来表示能力,但can只有现在时与过去时,be able to则可用任何时态,如:He will be able to teach the child. 但要表示经过努力而达到的一次性动作则只能用be able to,如:He finally was able to jump over 210 meters. 或:The plane was able to fly over the mountain. 但要注意的是这两个词都没有进行时态,而be able to后面不接不定式的被动态。

  can could 

  can与could都可以用在现在时的口语中,只是用could更为礼貌,语气更委婉。如:Could you tell us a story?

  care 

  [误] I don‘t care coffee.

  [正] I don‘t care for coffee.

  [误] Take care for your steps.

  [正] Take care of your steps.

  [析] care for是"对某物感兴趣",而care of是"关心,要当心某事",如:She didn‘t care for him. Take care of what you are doing.

  [误] I don‘t care where we will go if it doesn‘t rain.

  [正] I don‘t care where we go if it doesn‘t rain.

  [析] 在it doesn‘t matter, I don‘t care, I don‘t mind, 及in case引出的状语从句后面要用现在时表示将来。如:I‘ve got a football in case we have time for a game.

  change 

  [误] I want to change my camera with that one.

  [正] I want to change my camera for that one.

  [析] change for为"以某物为交换物"。而change with则是"随……而变",如:The wood‘s colour changed with the season.

  cheap 

  [误] A teacher‘s salary is generally very cheap.

  [正] A teacher‘s salary is generally very low.

  [析] 工资的高低要用low,cheap是指价格便宜,如果要讲物美价廉则要用not expensive, 如:This car is not expensive.

  choose 

  [误] We each had to have a choose of A or B.

  [正] We each had to have a choice of A or B.

  [析] choice是名词,而choose是动词。

     

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