1、while作连词表示“当......时候”,强调主从句的动作同时发生。比如:He could learn more while he worked in the company. 他在公司工作的同时,能学到很多。
2、while作连词表示“然而”,强调前后的对比转折。此时,while常放在句中。比如:Tom likes reading at home while I prefer playing outside. 汤姆喜欢在家读书,然而我跟愿意到外面玩。
3、while作连词可以放到句首,表示“尽管”,相当于although . 比如:while he is a child , he knows a lot . 尽管他是个孩子,他知道的很多。
4、因为while引导的是状语从句,所以当符合状语从句的省略时,可以采用省略形式,变成while+doing或while+done的形式。比如:He found a poor dog while he was walking in the street .可改成: While walking in the street , he found a poor dog .