你nǐ好hǎo吗ma？

To ask a yes/no question, add 吗 to the end of a statement; nothing else moves. 你好吗？ is literally "you good?": how are you? Answer with the statement itself: 我很好。 Say 吗 short and light, with no tone. 你好！ without 吗 is just hello, not a question.