如果你有事情要做，或者脑子里有一个绝妙的主意要处理，做个笔记。

If you have things to do or a brilliant idea on your mind to tackle later, make a note.

youdao

如果你有事的话，就不要来了。

Don't come if you're busy.

《新英汉大辞典》

如果你有事想跟我说，我可是洗耳恭听。

If you want to say something to me, I'm all ears.

youdao

If you have, if you know you have a conflict with one of those quiz dates now John please see John or I right away.

如果你有事，如果你现在就知道,你有事和这两天冲突了,请马上来见我和。

麻省理工公开课 - 计算机科学及编程导论课程节选