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》

It is polite to say please if you want something.

对别人有所要求时，“请”说个字才有礼貌。

youdao

Please go outside and come back in and say that there's something wrong with your 'ear' or whatever.

请出去再来一次，说你的‘耳朵’啊或者其他什么的有问题。

youdao

But if you say "Would you please do something?",

但如果你说“能请你帮我做某事吗？”

Would you please 课堂 - SpeakingMax英语口语达人

Would you please let me say something?

你能让我说几句吗？

Would you please 课堂 - SpeakingMax英语口语达人

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

"As a person early in my career, I'd say do please say something!"

FORBES

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

FORBES