2018-2019学年英语人教版必修4学案:Unit 2 Section Ⅲ Grammar— 动词-ing形式作主语和宾语 Word版含解析
2018-2019学年英语人教版必修4学案:Unit 2 Section Ⅲ Grammar— 动词-ing形式作主语和宾语 Word版含解析第2页

一般式 doing being done 完成式 having done having been done   

  动词­ing形式在句中的语法作用:动名词在句中作主语、宾语、表语和定语,现在分词在句中作状语、宾语补足语和定语。

  一、动词­ing形式作主语

  1.动词­ing形式作主语时,往往表示经常性、习惯性的动作,通常置于句首。

  Reading aloud is a good way to learn a language.

  大声朗读是学习语言的一种好方法。

  Wasting a person's time is the same as killing him for his property.

  浪费别人的时间无异于谋财害命。

  [名师点津] (1)不定式作主语表示具体的或一次性的动作。

  To lie to her is wrong.

  对她撒谎不对。

  (2)动名词作主语时,谓语动词用单数。

  Climbing mountains is really difficult for the old.

  对于老人来说爬山确实困难。

  [即时演练1] 补全句子

  ①Playing_with_fire is dangerous.

  玩火危险。

  ②Be careful!To_play_with_fire will be dangerous.

  小心点!玩火会带来危险。

  ③Swimming_is_a_good_sport in summer.

  夏天游泳是一项好的体育活动。

  2.形式主语it代替动词­ing形式作主语。

  此类句式常见的有:

  It's a waste of time doing sth.

           做某事是浪费时间

  It's useless/worthwhile doing sth.

   做某事没用/是值得的

  It's no good/use/fun doing sth.

   做某事没用/没意思

It is no use waiting for other people to make decisions for you.