i can't have any pets (because my mother hates them)对划线部分提问.为什么是why can't

问题描述:

i can't have any pets (because my mother hates them)对划线部分提问.为什么是why can't
情态动词要加not吗.这到底是什么结构呀

这是因为对划线部分提问的疑问句谓语动词要和主句的谓语动词一致