do not forget to turn off the lights before leaving the room 为什么是leaving 不是leave

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donotforgettoturnoffthelightsbeforeleavingtheroom为什么是leaving不是leavedonotforgettoturnoffthelightsbefo

do not forget to turn off the lights before leaving the room 为什么是leaving 不是leave
do not forget to turn off the lights before leaving the room 为什么是leaving 不是leave

do not forget to turn off the lights before leaving the room 为什么是leaving 不是leave
before doing sth 固定搭配
LS说的也很对,再举个例子
1.We must have a plan before doing any work.
做任何工作前,我们必须订好计划.

before 为介词后接动名词即V-ing

before 是介词，后加doing

before是介词，介词后面接名词或表名词词性的词。leave+ing 表名词词性。
如果后面接的是一个句子，可以考虑用动词的时态。

按理说此题应该是考察知识点Why don't you = Why not，注意Why not不能Why don't you turn off the lights before leaving the classroom?

Do not forget to t_____Tom the news. I do not want to forget you Don not forget to do your do not forget my pronmise to forget your good i do not want to forget you I do not forget I do not want to forget!不知道什么意思 Do not forget to be late的答语 After leaving, I hope you do not forget one thing: Do not forget to miss me.是什么意思. Do not forget the love do not forget的意思 forget to do forget doing 的区别 Do not want to think of you,but you can not forget do not forget to bring your camera回答i did 还是i do don not forget forget to turn off the lights 的回答回答是OK,I_____ A do not B will C do D will not 将Do not forget to arrive here at 7:30 this evening改为同义句,4月24日16：将Do not forget to改为两个单词 Do not forget ()your homework here tomorrow.A.takingB.to takeC.to bring Do not forget what you once owned ;Value what you have owned ;do not desert what belongs to you;bea