It is raining cats and dogs.

那么就满天下猫和狗吧！

You can not go tonight, it is raining cats and dogs.

你今晚不能出去，正在下倾盆大雨。

You cannot go out tonight, it is raining cats and dogs.

你今晚不能出去，正在下倾盆大雨。

You may hear someone say "it is raining cats and dogs."

你可以听到有人说“这是下雨猫和狗。

It has been cloudy all morning and now it is raining cats and dogs.

整个上午天阴沉沉的，现在下起了大雨。