forget to do sth与forget doing sth 的区别

来源:网络 编辑:天天

1. forget to do sth 忘记要去做某事。 (未做)

2. forget doing sth 忘记做过某事。  (已做)

例句:

The light in the office is stil on. He forgot to turn it off.
 办公室的灯还在亮着,它忘记关了。(没有做关灯的动作)
He forgot turning the light off. 
 他忘记他已经关了灯了。    ( 已做过关灯的动作)
Don't forget to come tomorrow.
 别忘了明天来。         (to come动作未做)

典型例题
 ---- The light in the office is still on.
 ---- Oh,I forgot___.          
  A. turning it off  B. turn it off  C. to turn it off  D. having turned it off
  答案:C。由the light is still on 可知灯亮着,即关灯的动作没有发生,因此用forget to do sth.
而forget doing sth表示灯已经关上了,而自己忘记了这一事实。此处不符合题意。