diamonds do not look very impressive as they are mined钻石刚开采时并不光彩照人.这里为什么是do not 而不是are not

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diamondsdonotlookveryimpressiveastheyaremined钻石刚开采时并不光彩照人.这里为什么是donot而不是arenotdiamondsdonotlookveryi

diamonds do not look very impressive as they are mined钻石刚开采时并不光彩照人.这里为什么是do not 而不是are not
diamonds do not look very impressive as they are mined钻石刚开采时并不光彩照人.
这里为什么是do not 而不是are not

diamonds do not look very impressive as they are mined钻石刚开采时并不光彩照人.这里为什么是do not 而不是are not
如果用are的话,那look就不用原型了啊,look是系动词啊,不能再有Be动词

Are not 前一般用的是人,比如说 You are not alone。Do not 为助动词do的否定形式