It is strage that he should have come back so early.
It is strage that he should have done...中的should是什么用法?
It is strange that he should have come back so early.
本句中的情态动词should 为推定式should (putative should), 在that从句中表示“居然、竟然”这样的感情色彩,表示怀疑,不相信从句是真的,觉得从句所说的事情是不可思议的。传统语法将should的这种用法归到虚拟语气。本句也可以不用should, 而直接用陈述语气动词形式,这样便是平铺直叙事实,没有了上述感情色彩。
It is strange that he came/has come back so early.
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