What we need are good doctors.为什么谓语是are而不是is,主语是waht啊

What we need are good doctors.为什么谓语是are而不是is,主语是waht啊 His parents are doctors.为什么谓语是are doctors 而不是are? 1.what we need is time 2.what we need are good doctors 这两句话为 What we need are good doctors这句话为什么要用复数丫, 把“all kinds of food ”作为主语,为什么谓语是are而不是is呢 what we want ---good textbooks 是IS还是ARE 主语是every boy and every girl 谓语用is还是用are?为什么? 主语是两个不可数名词用and连接,谓语用is还是用are?为什么? 为什么What are you doing ,Li Yan?"you"前是“are” 而不是“is” what we need most are/is books? what we need most are books谓语动词为什么用复数呢? 为什么是what is your name 而不是what are your name