while后一定要是进行时态吗？
while后不一定是进行时态。
具体需要根据上下文和时态来定，while后的句子时态可以是一般现在时，也可以是过去时态、进行时态等。while的具体用法如下：
1、“当??时候”， 引导时间状语从句(从句动作必须是延续性的)。
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”相当于although，引导让步状语从句(常把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，引导条件状语从句。
There is hope while there is life. While you study hard， your effort will pay off。
扩展资料：
一、while做名词用，表示“一会儿；一段时间”。
1、She likes to lie down for a while after lunch.
她喜欢午饭后躺一会儿。
2、Coming to another country to study requires a big a adjustment and it takes a while to fit in.
来到另一个国家求学，需要花一段时间来适应。
二、while作连词用，表示引导时间状语。
1、We must strike while the iron is hot.
趁热打铁
2、While she was listening to the radio,she fell asleep.
她听着收音机睡着了。
三、while作并列连词用，意思为“而；然而”。
Some people waste food while others haven't enough.
有些人很费粮食，然而有些人却吃不饱。
温馨提示：while也可作并列连词，表示两个动作的对比，译为“而；然而”。
