Report as soon as anything happens.

一有动静，马上来汇报。

youdao

If anything happens to him, let me know at once.

如果他出了什么事，请立刻通知我。

《新英汉大辞典》

I'll call you if anything happens, I promise.

我保证，如果发生什么事我会打电话给你。

youdao

If anything happens, I swear to God... Nothing's gonna happen.

VOA: standard.other

If anything happens to me in my livelihood, then it's spread out over everybody and everybody means the whole world.

如果我的生计出问题了，它将分散到每个人身上,每个人指全世界的人。

耶鲁公开课 - 金融市场课程节选

but it happens so it's not anything too weird.

但是有人这么做的，所以不算奇怪。

住宿环境怎样？ - SpeakingMax英语口语达人

God forbid anything happens, I just don't know how they can say this without proving it.

BBC: Ofcom said there were 70 such cases in 2006

When anything happens to remind Americans that the world is a dangerous place, Mr McCain's stock rises.

ECONOMIST: John McCain

"If anything happens, we're all going to stay right here with you, " she remembers telling her husband.

BBC: New Jackie Kennedy tapes offer White House insight