while可以作连词,也可以作名词。
1 .“While”作连词时,可以表示 “在……的时候,与……同时”。“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 “(对比两件事物)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”,常置于句首。
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 “一段时间;一会儿”。
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.