Is it raining?

下雨了吗？

《牛津词典》

Is it raining outside now?

现在外面下雨吗？

youdao

Is it raining or snowing?

在下雪还是在下雨啊？

youdao

"It's" with an apostrophe is short for "it is," as in "It's raining."

VOA: special.2010.02.11

So problems arise but they're interesting problems, and they are a function, one of the six functions, of the expression "It is raining."

问题就出现在这里，但这是有趣的问题,是六功能中的一个“

耶鲁公开课 - 文学理论导论课程节选

It's really, in a sense, the physical image is of rain; it's raining, so it's leaking all over it.

这在某种意义上确实是，下雨的一种具体的描述;,因为在下雨，所以天空像是在漏水。

耶鲁公开课 - 1945年后的美国小说课程节选

Is it raining where you are?

FORBES: Promoted Tweets: I'm Being Followed by Rogaine

And basically what they found was that it is harder to find a taxi when it is raining.

FORBES: Employee remuneration systems are often based on the wrong assumptions

It is much harder to repair the roof when it is raining.

ECONOMIST: The danger of delay