Formal:
* 你愿意嫁给我吗? (Nǐ yuàn yì jià gěi wǒ ma?) - This is the most direct and formal way to ask.
* 你愿意成为我的妻子吗? (Nǐ yuàn yì chéngwéi wǒ de qīzi ma?) - This means "Would you be my wife?" and is also quite formal.
Informal:
* 你愿意嫁给我吗? (Nǐ yuàn yì jià gěi wǒ ma?) - The same phrase as the formal one, but can be used in a more informal setting with a close friend or family member.
* 你愿意和我结婚吗? (Nǐ yuàn yì hé wǒ jiéhūn ma?) - This is a more casual way to ask, but still conveys the same meaning.
* 你做我老婆好吗? (Nǐ zuò wǒ lǎopo hǎo ma?) - This is a very informal and colloquial way to ask, meaning "Will you be my wife?"
Romantic:
* 你愿意嫁给我,跟我一起度过余生吗? (Nǐ yuàn yì jià gěi wǒ, gēn wǒ yīqǐ dùguò yúshēng ma?) - This is a more romantic way to ask, meaning "Would you marry me and spend the rest of our lives together?"
Remember that the best way to say "Would you marry me?" in Chinese depends on your relationship with the person and the context of the situation.