A small trick.
"You don't like Italian food?"
"You don't wanna come?"
"You aren't happy?"
Indeed, many Chinese people are not used to Italian food. However, most of us have difficulties in answering such a negative interrogative.
One of my friends have been in the America for 15 years, but he still don't know how to answer this type of questions.
Occasionally, I make mistakes with such questions, too. However, I can handle them gracefully in most cases. My trick is never using simple "yes" or "no". I do my best to say "Yes, I do", "Yes, I can", "Yes, I am", "Yes, I have", "No, I am not", "No, I don't", "No, I can't"... In doing so, I find I can correcty express myself.
For me, improving my English is securing my life. Unfortunately, I will never be able to speak as those native English speakers.