as if 引导的从句可用虚拟语气,1,与现在事实相反用一般过去时,2.与将来事实想反用过去将来时,3.与过去事实相反用过去完成时.如果事实上他们是多年的老朋友.应该这么说 They have been friends for years.本句：他们谈起话来就好像是多年的老朋友了.（事实上他们不是,所以现在完成时改成过去完成时.
they talk as if they had been friends for years .这里为什么用had b
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