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.
"Tu ne parles pas français" means "You do not speak French" in French.
Yes - ça va? means how are you?
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."
n'a pas été
it means not you
It means "not"
Either not or a step
it means "not me"
pas trés bien - not very well