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They are all lined up next to the door.

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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.
都可以 一个表示状态,一个表示动作
类似的
we were worried about her 状态
we worried about her 动作
要分呀!