请教老师Those women are very hard-working中为什么要加are呢,这个be动词起到什么作用

请教老师Those women are very hard-working中为什么要加are呢,这个be动词起到什么作用 Those women are very hard working those加可数名词,例如those women are very hard-working. those women are very hard-working.求它的语法结构~.` I t____ you are very hard working 为什么要加are?I am younger than you are?请问这个are有什么用?已经有be动词了啊~ you的be动词为什么要加are要是you是单数呢 Germans are often c___ to be precise and very hard-working. They are hard-working. you的be动词为什么要加are? you的be动词为什么要加are you are not be alone 为什么要加be呢?