8.2 forget doing/to do
?
 forget 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 stil on. He forgot to turn it off.
 辦公室的燈還在亮著,它忘記關(guān)了。(沒有做關(guān)燈的動(dòng)作)
 He forgot turning the light off.
 他忘記他已經(jīng)關(guān)了燈了。    ( 已做過關(guān)燈的動(dòng)作)
 Don't forget to come tomorrow.
 別忘了明天來?!       ?(to come動(dòng)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(guān)燈的動(dòng)作沒有發(fā)生,因此用forget to do sth.
而forget doing sth表示燈已經(jīng)關(guān)上了,而自己忘記了這一事實(shí)。此處不符合題意。