While Jim was mending his bike, Lin Tao came to see him. 正当吉姆修自行车时,林涛来看他。
(3) 另外,when和while的区别还在于:while引导的时间状语从句多用进行时态,而when引导的时间状语从句多用一般时态。
While they were talking , the bell rang. 正在他们谈话的时候,上课铃响了。
I was doing my homework when my mother came back home yesterday evening. 昨天晚上妈妈回家的时候,我正在做家庭作业。
二、语法详解
过去进行时:过去进行时表示过去某一时刻或者某段时间正在进行或发生的动作,常和表过去的时间状语连用,如:
I was doing my homework at this time yesterday.
过去进行时的构成:
肯定形式:主语+was/were+V-ing
否定形式:主语+was not (wasn‘t)/were not (weren‘t)+V-ing
疑问形式:Was/Were+主语+V-ing.
基本用法:
1.过去进行时表示过去某一段时间或某一时刻正在进行的动作。常与之连用的时间状语有,at that time/moment, this time yesterday at+点钟+yesterday ,when sb. did sth等时间状语从句,如:
What were you doing at 7p.m. yesterday?
I first met Mary three years ago.
She was working at a radio shop at the time.
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