In negative questions either add a question mark to a statement and change your voice to a questioning tone, or insert est-ce que into the question. The negative form or never, not, nothing, nobody, ...

"Aren't you coming too?" "Yes...I mean, no? I mean, yes, I'm coming." When answering a normal, positive question, you're unlikely to fumble around like this. If the question is "are you coming too?" ...