I beg you, from the bottom of my heart, to spare his life.

我诚心诚意地恳求你饶他一命吧。

《牛津词典》

Put me down, I beg you.

把我放下来，我求你了。

youdao

I'm writing this letter to beg you for your forgiveness.

我写这封信是为了请求你的原谅。

youdao

So,I beg you to accept me for a journey to America."

VOA: special.2010.05.13

If You would deal thus with me, kill me rather, I beg You, and let me see no more of my wretchedness!"

如果您这样对待我，还不如杀了我，我请求您，不要再让我如此的可怜“

耶鲁公开课 - 旧约导论课程节选

and literally beg you for whatever they want like, if it's money, something to drink, food.

求你给他们一些东西，钱、喝的、食物，什么都可以。

流浪者们很奇怪 - SpeakingMax英语口语达人

"I beg you for God's sake that you never do, " she is quoted as saying by the AFP news agency.

BBC: Karachi security - file photo from 2002

So, I beg you to consider these four questions the next time you have a negative experience with your agency.

FORBES: The Agency Review: Sometimes The Pitch Is Best Left Unpitched.

Then I ask you, I plead with you, I beg you all, walk out of here with me, never to come back.

FORBES: Robert Wenzel to Federal Reserve: "Leave the Building to the Four-Legged Rats"