when,while都有“当……时候”的意思。when既可表示某一点时间,也可以表示某一段时间 。在when引导的时间状语从句中,其谓语动词可以是延续性的,也可以是非延续性的,可与主句中的谓语动词同时发生,也可在其后发生。 例如:1、I was just reading a book when she came into my room. 她走进我房间时,我正在看书。 2、Were you writing when the teacher came in? 老师进来的时候,你在写信吗? 3、When he was a child he was always trying out
1 背景介绍While 和 When 都可以被用来介绍比较长的“背景”行为或场景。这些行为和场景是在某事发生的同时,正在进行的“背景”Somebody broke into the house when they were playing cards.While they were playing cards, somebody brok