every day 与 everyday
1. every day 作状语，译为每一天。如：
We go to school at 7:10 every day. 我们每天7：10去上学。
I decide to read English every day. 我决定每天读英语。
2. everyday 作定语，译为日常的。
She watches everyday English on TV after dinner. 她晚饭后在电视上看日常英语。
Whats your everyday activity? 你的日常活动是什么?
forget doing/to do与remember doing/to do
et to do 忘记要去做某事。 (未做)
forget doing 忘记做过某事。 (已做)
The light in the office is still 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)
Dont 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
