while doing用法讲解

while可以翻译成“当…的时候”,这时候它引导的从句常用用过去进行时,主句可以是一般过去式或过去进行时。那while doing(或when doing)是怎么来的呢?今天我给大家说一下。

当while引导的从句中的主语跟主句的主语是同一个人或物时,这是while引导的从句中的主语和be动词可省略,故而就变成了while doing。给大家看个句子:

He was selling the newspaper while he was waiting for the bus.

=He was selling the newspaper while (he was )waiting for the bus.(he was可以省略)

=He was selling the newspaper while waiting for the bus.

他边等车边卖报。

再看下面的句子:

My mother was cooking while I was watching TV.

大家看到这个句子主句的从句的主语不一致,所以不能写成while doing这个的结构。

注:while doing=when doing,用法是一样的,例如:

He was selling the newspaper while waiting for the bus.

=He was selling the newspaper when waiting for the bus.

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