Why don't you play the piano ?的同意句是什么

why not play the piano，，
哈哈~，这个我们这学期第1课的内容么！

why don：t = why not，
过几天期末考试 了

Why do you not play the piano?

You don't want to play the piano?

上面第2.个和第3.个人的回答是错的；只有第一个人答对。

what don't you play the piano for?

play the piano? 简洁明了