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这句话是什么意思？？？？尤其是should及其后面的部分，为什么可以这样放？？

are they, do they 区别 Who are they ?They are teachers.(改错 They are all upset. They are good entertainment, How oid are they? They always are 是什么意思？ They are neighbors. 他们都是,是both are they 还是 they both are? Just because they are criminals, they are not bad people . Though they are twins,they are not always___each other.