ça va pas !? means 'are you mad ?!' in French.
Depending of context, it can also be a familiar question to enquire about someone's health.
Yes - ça va? means how are you?
tu ne parles pas français mean : you don't speak French
tu n'es pas gentil, pas gentille
Pas mal means 'not bad' in French.
"Il n'est pas" in French means "He is not" in English.
You can say "Je n'ai pas" in French to mean "I don't have."
It means "not"
n'a pas été
it means "not me"
it means not you
Either not or a step
It means Yes, How are you?