while表示“尽管”时引导什么从句?

while引导状语从句的主要用法有两种
1.表示“当(在)……的时候”.如：
We must strike while the iron is hot.我们要趁热打铁.
Were there any calls for me while I was out?我出去的时候,有人来过电话吗?
Stand still while I take your photograph.我给你拍照时站着不要动.
2.表示“尽管,虽然”.如：
While the work was difficult,it was interesting.虽然工作有难度,但很有趣.
While I understand what you say,I can’t agree with you.虽然我理解你的意思,但我还是不同意.
3注意：While引导的从句的谓语动作必须是延续性的,并强调主句和从句的动作同时发生（或者相对应）.并且while有时还可以表示对比.例如：
While my wife was reading the newspaper,I was watching TV.(was reading是延续性的动词,was reading和was watching同时发生)
I like playing football while you like playing basketball.我喜欢踢足球,而你喜欢打篮球.（对比）

让步状语从句，一般置于句首