没--1，this is not+noun/i have not + noun 2, +verb= not yet 不--1.not 2.dont example of mei--he has not a pen he is not a pen example of bu-- he hasnt married yet he wont marry.

没有 = there isn't 不是 = (it) isn't

“没”means"haven't". “不”menns"no".

没 mei means 'have not' or 'not' It is a prefix prefix for verbs. Examples: wo mei you kong 我没有空 I don't have free time. 屋 子 里 没 人 。 wu zi li mei ren. There is no one in the room ( literally : In the room have not people) Notice that the literal translation doesn't make much sense,because of the reversed sentence structure in Chinese. 不 bu means 'not' or 'no' a negative prefix Examples: 我不可以 wo bu keyi I can not ( can't) 我 不 喜 欢 游 泳 。 wo bu xihuan youyong I don't like swimming . " 你 累 了 吧 ？ 不 ， 不 累 。 ni lei le ba? bu , bu lei. Are you tired? No, not tired. Here 'bu' occurs with both meanings 'not' and 'no'.

He does not go. 他没去。 He will not go. 他不去。 the way to understand this two words is reading more sentence. http://dj.iciba.com/ type your keyword '不去''没去' in the searching textbox.