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2014年河南专升本英语语法考点总结(十二)

2013-12-12 15:25:03 http://www.yeluzsb.com 来源:
  6、作表语   不定式可放在be动词后面,构成表语。如:   Thequestionishowtoputitintopractice.   Myquestioniswhentoleave.   Hisdreamistobeadoctor.   Herworkistolookafterthebabies.   注意:(1

  6、作表语
  不定式可放在be动词后面,构成表语。如:


  The question is how to put it into practice.
  My question is when to leave.
  His dream is to be a doctor.
  Her work is to look after the babies.
  注意:(1)不定式在句中作表语时,对应的谓语动词用单数。
  (2)当助于是不定式时,表语不能用V-ing形式,可用不定式。
  如:To see is to believe. 眼见为实)


  7、独立结构。如:
  To tell you the truth, I don't agree with you.
  To make matters worse, it began to rain.


  二、不定式的时态和语态


  1、不定式的时态
  (1)现在时:有时与谓语动词表示的动作同时发生,有时发生在谓语动词的动作之后。如:
  He seems to know this.    I hope to see you again.


  (2)完成时:表示的动作发生在谓语动词表示的动作之前。如:
  I'm sorry to have given you so much trouble.
  He seems to have caught a cold.


  (3)进行时:表示动作正在进行,与谓语动词表示的动作同时发生。如:
  He seems to be eating something.


  (4)完成进行时:表示动作从过去某个时间开始,一直延续到现在,并有可能持续下去。如:
  She is known to have been working on the problem for many years.


  2、不定式的语态
  当不定式的逻辑主语是其动作的承受者时,就用被动式。如:
  He was seen to enter the hall.      He asked to be sent to work in Tibet.

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