forget doing/to do

forget doing/to do

　forget doing　忘记做过某事。　　(已做)

　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 d