Please excuse me, but there is something I must say.

请原谅，不过有件事我必须说一下。

《柯林斯英汉双解大词典》

Please say something about your hobbies.

请你谈一下你的嗜好。

youdao

Would you please say something about your family?

你能介绍一下你的家庭情况吗？

youdao

You could simply say, "Please, do something".

你可以简单地说，“请帮我做某事”。

Would you please 课堂 - SpeakingMax英语口语达人

Regardless of the outcome, please say something, Steve Ballmer.

FORBES