why is your shoe so expensive.why your shoe is so expensive.

前句是特殊疑问句,问“你的鞋子为啥那么贵”?后句不是直接问出来的,而是一般作为宾语从句出现的。特殊疑问句做从句时,语序不能再是倒装形式------即不能是is your shoe,而应该是your shoe is正确的特殊疑问句做从句的举例：I don't know why your shoe is so expensive。I wonder when you will go to Beijing。I don't know what the answer is。