你好吗？nǐ hǎo ma? 1、This sentence is not often used between Chinese. 2、If you just want to speak “hello” to somebody, you can say “nǐ hǎo(你好）”or “nín hǎo(您好）” instead of “nǐ hǎo ma?（你好吗？）” 3、If you want to know your friends how does his/her life recently, you can say “zuì jìn hǎo ma?（最近好吗？）” instead of “nǐ hǎo ma?（你好吗？）”. If you want to learn Chinese, maybe i can help you.