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。

I thank you from the bottom of my heart for helping me solve this problem.

我从心底感激你帮助我解决这一问题。

I deeply love my hometown where I spent my childhood from the bottom of my heart.

我发自内心地热爱我的家乡，我的整个童年都是在这里度过的。

I thank you from the bottom of my heart.

我从心坎里感谢你。

I pity him from the bottom of my heart.

我从内心深处怜悯他。