我正要下班，这时，天开始下大雨了。

Iwasaboutto leave work when it began to rain heavily.

更糟糕的是，开始下大雨了。

Worse still, it began to rain heavily.

昨天夜里下大雨，你听见了吗？

Did you hear the storm last night?

由于下大雨，他迟到了。

He was late due to the heavy rain.

下大雨了，人们都飞跑着寻找躲雨的地方。

There was a general scuttle for shelter when the rain began to fall heavily.

噢，天要下大雨了。我们快躲雨去。

Oh, it's going to pour with rain. Let's run for shelter.

如果下大雨，比赛只有延期。

If it rains hard we have to put off the match.

我们出发时正下着大雨。

It was raining hard when we set off.

下着大雨，再加道儿不熟，所以他迟到了。

What with the heavy rain and his not knowing the way, he was late.