what shapes are the ball还是what shape are the ball

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what shapes are the ball还是what shape are the ball
what shapes are the ball还是what shape are the ball

what shapes are the ball还是what shape are the ball
shape和ball的单复数是对应的,一个球最多只有一个形状,肯定是单数动词is;多个球可能是多个形状,也可能是一个形状,但肯定是复数动词are.
所以可能的搭配是:
What shape is the ball?
What shape are the balls?
What shapes are the balls?