全国大众英语测验语法——forgetdoing/todo
forget to do忘失落要往做某事。?未做)
forget doing忘失落做过某事。?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，它忘失落关了。(没有做关灯的举措)
He forgot turning the light off.
他忘失落他已经关了灯了。?(已做过关灯的举措)
Don't forget to come tomorrow.
别忘了本日来。?(to come举措未做)
典范例题
---- 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
谜底：C。由the light is still on可知灯亮着，即关灯的举措没有发作，因此用forget to do sth.
而forget doing sth默示灯已经打开了，而自己忘失落了这一毕竟。此处不符合题意。

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