Are your shirts made of cotton?这里面的名词shirt为什么要加s?而Is the book made of wood?里面的book 不用?

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Are your shirts made of cotton?这里面的名词shirt为什么要加s?而Is the book made of wood?里面的book 不用?

Are your shirts made of cotton?这里面的名词shirt为什么要加s?而Is the book made of wood?里面的book 不用?
Are your shirts made of cotton?这里面的名词shirt为什么要加s?而Is the book made of wood?里面的book 不用?

Are your shirts made of cotton?这里面的名词shirt为什么要加s?而Is the book made of wood?里面的book 不用?
因为此句的be 动词是复数【are】,主语your shirts 如果不加s 变为复数的话,主谓语在数上就不一致了
第二句之所以the book 不加s,是因为前面的be 动词是单数Is,不是are