为什么是what kind of movies?用kind不用kinds?

为什么是what kind of movies?用kind不用kinds? what kind of pet为什么是pet不是pets,这里都是单数吗 Do you know what letter is a kind of drink?为什么是茶 求解tell me what kind of bird this is?为什么是this is而不是is this? MOV R4,#15 作用?为什么是R4? what kind of movie what kind of movies What kind of movies_____Mike_____? what kind of fruit? What kind of fruit? what kind of 用法 what kind of是什么意思 what kind of man was he 这句话应该如何翻译.为什么是这样的结构.请认真回答. do you know what kind of work ___ ____ do 为什么是 I could而不是 could I what kinds of还是what kind of what kind of food还是what kind of foods what kind of animal or what kind of animals what kind of 什么意思?what kind of 什么意思!