可以表示(shì)过去(qù)同时(shí)发生(shēng)或者现在正在(zài)同时发生某事。

　　1、“当……时候(hòu)”，引导时间状语从(cóng)句(从句动(dòng)作必须(xū)是延续性的)。

　　Please don't talk so loud while others are working.

　　While I was cleaning the window，my finger was seriously cut。

　　2、“虽然，尽管”相当(dāng)于although，引导让步状语从句(常(cháng)把while放在句首)。

　　While she is a top student， she has some shortcomings. While the Internet is bridging the distance between people， it may also be breaking some home or will cause other family problems。

　　3、“只要，如果”等于as long as，引导(dǎo)条件状语(yǔ)从句。

　　There is hope while there is life. While you study hard， your effort will pay off。

while的前后时态口诀

　　while的瞎棚前后(hòu)时态口蚂世诀(jué)：当while表示同时的时候，主句和(hé)从句的时态是一致的，既(jì)可以都是一般现(xiàn)在(zài)时，又可以(yǐ)都(dōu)是一般过去时。

　　可以表(biǎo)示过(guò)去同时(shí)发生或者现在正(zhèng)在同时发生某(mǒu)事。

　　1、“当……时候”，引导时间状语从(cóng)句(jù)(从句动作必须(xū)是延续性的)。

　　Please dont talk so loud while others are working.