forget doing/to do與remember doing/to do
et to do忘記要去做某事(未做)；forget doing忘記做過某事(已做)
The light in the office is still on. He forgot to turn it off.
辦公室的燈還在亮著，它忘記關了。(沒有做關燈的'動作)
He forgot turning the light off.
他忘記他已經關了燈了。( 已做過關燈的動作)
Dont forget to come tomorrow.
別忘了明天來。(to come動作未做)
典型例題
---- 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 可知燈亮著，即關燈的動作沒有發生，
因此用forget to do sth.而forget doing sth 表示燈已經關上了，而
自己忘記了這一事實。此處不符合題意。
mber to do記得去做某事(未做)；
remember doing記得做過某事(已做)
Remember to go to the post office after school.
記著放學後去趟郵局。
Dont you remember seeing the man before?
你不記得以前見過那個人嗎?
