今天有同学问我while的用法，while语句的用法，我索性整理了一下，写了这篇小文章跟所有同学分享。while是一个很重要的写作用词，用法很多，希望大家学完今天的微课就明白了它的用法。
while作名词用，表示“一会儿”：
1）She likes to take a nap for a while after lunch. 她喜欢午饭后眯一会儿。
2）it takes a while to fit in the society for an overseas student. 留学生需要花一段时间适应当地生活。
While作连词：
1.引导时间状语
1）We must strike while the iron is hot.趁热打铁。
2）While he is speaking, he likes to do a lot of gestures. 他演讲的时候有很多手势。
2. 引导让步状语从句，意思是“虽然…但是….”(多放于句首)
1）While he loves China, he finds it hard to live there after being abroad for long time. 虽然很爱中国，但旅居海外多年的他还是不适应中国的生活。
2）While my heart is willing, my flesh is weak. 心有余而力不足（虽然我的心是愿意的，但是我的肉体是虚弱的）
3. 引导条件状语，意思是“只要”
1）While there is life there is hope.留得青山在，不怕没柴烧。
2）While there is a way, there is away.有志者事竟成。
While作并列连词用，意为“然而”，表对比关系。而but表转折。（请注意体会下列例句中while与but的区别）：
1）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。
2）The son was having a good meal at home, while the parents were working in the fields.
儿子在家吃好饭而父母却在田里辛勤劳作。
3）I ought to have helped her, but I never could. 我本该帮她但没能。
4）Honey is sweet, but the bee stings. 蜂蜜很甜，但蜜蜂有刺蜇人。
连词“while”具有两种意义，因此为了避免误用，使用时需多加注意。
“while”作为连词来使用的时候，表示“同时性”或“对比性、对立”。根据文章的内容可明确该词具体表达了哪一种意义的情况固然存在，但如同下文中所展示的相反情况同样存在。
The temperature decreased while the growth rate increased.
这句话可产生“温度下降的同时生长速度加快了”和“与温度下降所不同的是，生长速度却加快了”两种翻译。
正解是：若要使后者的翻译成立，“decreased”和“while”之间的逗号必不可少，因此目前的情况下无法直接确定此句的翻译。为了使上文的句意能够明确，就该如同下文的例句一般进行修改。
同时性：
(1) The temperature decreased as the growth rate increased.
(2) The temperature decreased, and simultaneously, the growth rate increased.
(3) As simultaneous phenomena, the temperature decreased and the growth rate increased.
对比性：
(4) Although the temperature decreased, the growth rate increased.
(5) The temperature decreased, though the growth rate increased.
(6) The temperature decreased, but the growth rate increased.
(7) Whereas the temperature decreased, the growth rate increased.
(8) The temperature decreased, whereas the growth rate increased.
(9) Despite the fact that the temperature decreased, the growth rate increased.
*“while”除了连词以外还能作为其他此类来使用，不同的词性皆具其特有的意义。