They are all lined up next to the door.请问这句话中,为什么要有are,line 是一个动词,如果我写成They all lined up next to the door,哪一个是正确的呢?

They are all lined up next to the door.请问这句话中,为什么要有are,line 是一个动词,如果我写成They all lined up next to the door,哪一个是正确的呢? Are they all right They are all right. Are they all right? where are they all They are u----- the tree. they all are friend 还是 they are all friend They are all 17.还是They all are 17. They are all yellow 如上 They are all working ____.. They are all ____(price). They are all my ----------(cousin) They are all my loves all things are difficult before they are all things are difficult before they are The Send-offDown the close,darkening lanes they sang their wayTo the siding-shed,And lined the train with faces grimly gay.Their breasts were stuck all white with wreath and sprayAs men's are,dead.Dull porters watched them,and a casual trampStood sta 选择填空 they _______students A are all B all are 是all of them are 还是 all of they are