what's the price of 可以用复数吗

what's the price of中的be可以使用复数形式吗?还有price要不要变复数? what's the price of中的be可以使用复数形式吗? what's the price of 后加复数 回答用it's 还是they are what's the price of. what is the price of 这个短语中的price有复数形式的时候吗 what's the price of ...price加不加s What’s the price of the books? What's the price of the trainers?写出同义句What's the price of ( What is the price of these sweaters?这句话不是复数吗?为什么要用is?事先声明：这句 what's the price of.可省略为what's the price? What's the price of the black shorts? what's the price of the shirt?【改为同义句】