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forget to do 忘记要去做某事，forget doing 忘记做过某事。例如： The light in the office is stil on. He forgot to turn it off. 办公室的灯还在亮着，他忘记关了。（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） 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，而忘记了这一事实。此处不符合题意。 | 
