We were playing soccer on the playground when it started to rain heavily.

问题描述:

We were playing soccer on the playground when it started to rain heavily.

当我们还在操场上踢足球时,突然下起了大雨

当雨开始下大时, 我们正在操场上踢足球。

我们在操场上踢球的时候,天开始下大雨了