yoi nowa dou iu ka
Will you marry me?
In Japanese, donoyouni iu masuka better ni iitai

Question

yoi nowa dou iu ka
Will you marry me? 
In Japanese, donoyouni iu masuka better ni iitai

Answer

Title could be "どういえばいいですか　(Dou ieba iidesuka)　” 
Ｏｒ　”どうゆう言い方がいいですか　(Douyuu iikata ga iidesuka)” 

It depend on your circumstances: 
If you would like to be polite and formal, you would say 
Please marry me 
(僕と）結婚してください　（bokuto) kekkon shitekudasai 
Will you marry me (please)?
(僕と）結婚してもらえませんか　

If you would like to be more intimate 
Let's marry 
結婚しよう (Kekkon shiyou) 

Why don't you get marry to me? 
(僕と）結婚しないかい (Bokuto) kekkon shinaikai

Answer

Boku to kekkon shite kudasai!
僕と結婚してください！

Answer

Boku to Kekkon Shite Moraemasenka ?

Answer

Kekkon shite kurenai?

Answer

僕と結婚してしまいませんか
僕と結婚してしまったらどうですか

（冗談だけですけど）just joking .
こういう風にプロポーズしない方がいいですよ。

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