看外面，我想正在下雨。

Look outside, I think ___it ___is ___raining.

昨天下了一整天雨，所以我们待在家里。

Yesterday ___it ___rained all day, so we stayed indoors.

带把伞，以防晚些时候下雨。

Take an umbrella in case ___it ___rains later.