Negative Adverbs - 不、没（有）、不要
The adverb 不 (not) negates the present/future and habitual states. 没（有） negates the past or possession. 不要 expresses a prohibition.
不没（有）不要
不 + Verb/Adj (present, future, habit) 没(有) + Verb (past, possession) 不要 + Verb (prohibition)
请不要在这里吸烟
Please don't smoke here.
他昨天没来。
He didn't come yesterday.