Is it going to rain?

要下雨吗？

It is going to rain.

要下雨了。

It is not going to rain.

不会下雨。

It's going to rain soon.

很快就要下雨了。

It's going to rain later.

之后会下雨。

Because it's going to rain.

因为要下雨了。

I think it's going to rain.

我觉得要下雨了。

Do you think it's going to rain this afternoon?

你觉得今天下午会下雨吗？

Maybe it's going to rain later.

也许待会儿会下雨。

Betcha it's going to rain tomorrow.

打赌明天会下雨。