If something bad happens, please tell me.

如果有什么坏事发生，请告诉我。

youdao

The patrol can detect if something is going down or is about to go down.

巡逻队能发现是否有情况正在发生或即将发生。

《柯林斯英汉双解大词典》

We don't have any openings now, but we'll call you if something comes up.

眼下我们没有空缺的职位。如果有了，我们会给你打电话的。

《柯林斯英汉双解大词典》

Just play by the rules, so that if something wrong happens, here's who's responsible.

WSJ: For Graduation, a Gift of a 529

Problems are rare and if something ever came up Amy got it resolved with customer service.

FORBES: How Amy Promotes This Old House

"If something feels good to you, there isn't anybody who can persuade you differently, " Wyatt said.

CNN: Coming out late in life complex but not unusual