1 “While” 作连词时，可以表示 “在…的时候，与…同时”。注意，“while” 可以放在句首使用，也可以在句中使用，但后者的句子中不使用逗号。

While we were sleeping, it snowed! 

It snowed while we were sleeping!

While he was cooking, a parcel arrived.

A parcel arrived while he was cooking.

2 “While” 作连词时，可以表示 “但是，然而”。

One of the twins is shy, while the other is outgoing.

It took me an hour to solve this maths problem, while it took her only five minutes!

3 “While” 和 “whilst” 作连词时，可以表示 “虽然，尽管”，这是一个相对正式的用法，相当于 “although”。

While I know that sugar is bad for me, I can never say no to dessert!

While I understand that is your opinion, I'm afraid I do not agree.

4 “While” 作名词时，指 “一会儿，一段时间”。

It's been a while since we talked.

Are you looking for Jessica? I saw her a short while ago. 

5 表达 “worth your while” 的意思是 “值得你下功夫去做，对你有帮助”。

Even though we only had a short while together, we hope this lesson was worth your while.

Check out this article about how to keep a healthy diet – I promise it will be worth your while.