How do you write till death do us part in Chinese?

Answer 1

直到死亡把我們分開

the literal translation above does not adequately convey the poetic meaning of the idiom, suggest using this:

永不分離 yǒng bù fēn lí - idiom meaning will never be apart

天長地久 tiān cháng dì jiǔ - forever (lit. for as long as the sky and earth exists)