We do not want it to rain cats and dogs.

我们不希望天下猫下狗，瓢泼大雨。

I was about to leave, when it begin to rain cats and dogs.

我正要离开，这时候下起倾盆大雨。

At this time, the sky was beginning to rain cats and dogs.

这时，天上开始下起了倾盆大雨。

Heardly had we left home when it began to rain cats and dogs.

我们刚离开家，就下起倾盆大雨来了。(刚刚)。

When we were well on the way, it began to rain cats and dogs.

我们正走到半路，天就下起大雨来了。