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新托福考试核心语法讲解30

2012-1-13 14:44| 发布者: bjangel| 查看: 267| 评论: 0

摘要: 新托福考试核心语法讲解30  第二节 分词  分词是动词的又一种非谓语形式,主要分为现在分词(ing为词尾)和过去分词(主要以ed结尾),他们在句中可作定语、状语或表语。  由于作表语的分词往往被视为形容词的 ...
新托福考试核心语法讲解30

  第二节 分词 
  分词是动词的又一种非谓语形式,主要分为现在分词(ing为词尾)和过去分词(主要以ed结尾),他们在句中可作定语、状语或表语。 
  由于作表语的分词往往被视为形容词的用法,其用法比较简单,这里只着重介绍前两种用法如: 
  exciting news (激动人心的消息), charming girl(迷人的女孩), 
  promising work(有希望的作品), known criminal(臭名昭著的罪犯), 
  broken bottle(破碎的瓶子) 
  考点一 现在分词 
  现在分词和过去分词的主要区别在于:现在分词表主动意义;过去分词表被动意义。 
  现在分词较过去分词形式灵活,除部分能接宾语之外,可有被动形式(being done)和完成式(having done, having been done), 当然being done和having been done也可理解成过去分词变形为进行式 
  1. 现在分词作定语 
  现在分词常接在名词之后作定语,经常可与定语从句替换 
  如:the man sitting behind me, 相当于:the man who is sitting behind me 
  the kids running about in the garden, 相当于: 
  the kids who are running about in the garden 
  单个的分词作定语可放在被修饰词之前,如:the sleeping baby, a running nose 
  改错题中若出现名词之后直接接动词,且之间是主谓关系,但不是句子主谓语,此处必定有错,可改为现在分词作定语 
  例题: 
  (1) 
  The boiled point of any liquid is determined by the pressure of the surrounding gases. 
  应改为:boiling. 
  解释:沸点的英文表达应该是boiling point. 类似的表达如: boiling water(沸水); boiled表示已完成的状态, 如boiled water意为白开水, 即已沸腾过的水
  (2) 
  The slide rule uses sliding scales with marks ---- numbers and their logarithms. 
  (A) representing 
  (B) represented 
  (C) are represented 
  (D) they are representing 
  答案:A 
  解释:空格前是句子的主谓成分,空格处需要marks的定语,C, D可先排除;B是被动式,无法接宾语numbers; 因此A正确,是现在分词作定语 
  2. 现在分词作状语 
  分词还可在句中作状语,可放在句首、句中或句尾。现在分词作状语时,通常都表示主语正在进行的动作/伴随动作或者表示原因。 
  1.现在分词短语可以作时间状语,相当于when, while, as soon as等所引导的从句 
  如:Hearing the news, he couldn’t help crying. 
  = When he heard the news, he couldn’t help crying. 
  2.现在分词短语也可以表示原因,代替由since, as等所引导的从句 
  如:Not knowing what to do about the situation, she turned to him for help. 
  =Since she didn’t know what to do about the situation, she turned to him for help. 
  Being so poor in those days, we couldn’t afford to go to school. 
  =As we were so poor in those days, we couldn’t afford to go to school. 
  3.如果分词表示的动作发生在主句动作之前,那么此时分词就需要用完成形式 
  如:Having finished the work, she went to the park. 
  =After she had finished the work, she went to the park. 
  特别注意:分词状语的逻辑主语和句子的主语要保持一致 
  如: Seeing from the moutain, the ocean is emrald green. 
  此句是一个错误的句子, 因为根据分词状语的逻辑主语和句子的主语要保持一致的原则, seeing的逻辑主语也应该是the ocean, 而the ocean是不能自己seeing的, 应改为Seen from the mountain. 
  例题: 
  (1) 
  Snow aids farmers by keeping heat in the lower ground levels, thereby ---- from freezing. 
  (A) to save the seeds 
  (B) saving the seeds 
  (C) which saves the seeds 
  (D) the seeds saved 
  答案:B 
  解释:thereby一词习惯上接现在分词作句子的结果状语,只有B符合要求

 

新托福考试核心语法讲解的延伸阅读——新托福语法技巧

 

  if从句中的动词用过去完成时,主句中的动词用条件完成时。这种句子所指的时间是过去;所提出的条件是不可能实现的,因为if从句中的动作在过去并未发生。

  If I had known that you were coming I would have met you at the airport

  要是我早知道你要来的话,我就会在机场接你了。(但我不知道,所以我也没去。)

  If he had tried to leave the country he would have been stopped at the frontier

  要是他当时试图离开这个国家,他就会在边界被阻拦。(但他并未这样做。)

  基本形式可能的变化形式

  1 可以用couldmight而不用would

 If we had found him earlier we could have saved his life

  要是我们那时早点找到他的话,我们会把他救活的。(能力)

  If we had found him earlier we might have saved his life

  要是我们那时早点找到他的话,我们可能会把他救活的。(可能性)

  If our documents had been in order we could have left at once

  要是我们的证明文件都齐备的话,我们那时就能够马上走。(能力或允许)

  2 可以用条件完成进行时:

  At the time of the accident I was sitting in the back of the carbecause Toms little boy was sitting beside him in frontIf Toms boy had not been there I would have been sitting in front

  事故发生的时候,我坐在车子的后座,因为汤姆的小儿子坐在前边他的身旁。要是汤姆的孩子没坐在那里的话,我就会坐在前面了。

  3 可以在if从句中用过去完成进行时:

  I was wearing a seat beltIf I hadnt been wearing one Id have been seriously injured

  我当时系了安全带。要是没有系上的话,我就会受重伤了。

  4 可以把类型2和类型3结合起来:

  The plane I intended to catch crashed and everyone was killedIf I had caught that plane I would be dead nowI would have been killed

  我原想赶乘的那架飞机坠毁了,所有乘客都遇难身亡。要是我赶上了那架飞机,我也就没命了/我就会摔死了。(类型 3

  If I had worked harder at school I would be sitting in a comfortable office nowI wouldnt be sweeping the streets

  要是在上学时学习再努力一些,我现在就会坐在舒适的办公室里,而

  不会是在扫大街了。(但我上学时不努力,因而我现在在扫大街。)

  5 had可以位于句首并省略if

  If you had obeyed orders this disaster would not have happened.相当于:

  Had you obeyed orders this disaster would not have happened

要是你当时服从了命令,这场灾难就不会发生了。

   


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