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同学好：
while 的用法包括---
1 引导时间状语从句，从句中的谓语动词应用延续性动词或表示状态的词。
While we were discussing the problem, George came in.
当我们正在讨论那个问题时,乔治走了进来。
Strike while the iron is hot.
趁热打铁。

2 引导让步状语从句，多用于句首，意为“尽管,虽然”。
While I admit his good points I can see his bad.
尽管我承认他的长处，但我也看到了他的不足。
While he loves his students, he is very strict with them.
虽然他爱他的学生,可是他对他们很严格。

3 作并列连词用，意思为“而,然而”，表前后意义上的对比或转折。
There's plenty of rain in the southeast, while there's little in the northeast.
东南部雨量充足，而西北部则很少下雨。
Some people waste food while others haven't enough.
有些人浪费粮食，然而有些人却吃不饱。

4 引导条件状语从句，意思是“只要”。
While there is a will,there is away.
有志者事竟成。
We can surely overcome these difficulties while we are closely united.
只要我们紧密地团结一致,一定能克服这些困难。

5 while可用作名词，意为“一会儿;一段时间”。
主要用于短语中：after a while“过了一会儿”;all the while“一直,始终”;a short/little while ago“刚才”;once in a while“偶尔、间或”;wait/rest (for) a while“等/休息一会儿”。
I haven't seen her for along while.
我好久没有看见她了。
He usually goes to work by bike,but once in a while he goes by bus.
他通常骑自行车上班,但偶尔也乘公共汽车。

请结合例句来理解吧！

祝学习愉快～