前者有语法错误.
助动词DO/Does在疑问句中是用来提问动词的.如上Do you play the piano?play是动词且因为是you,所以用do来引导.第三人称单数如he/she/it则用does引导.be动词则是用来引导形容词或名词等的,如Are you happy?(happy是形容词）Are you a student?