问题: there could have been 句式详细解释一下?
China has admitted that there could have been construction problems with some of the schools that collapsed during the Sichuan earthquake. 句中的“there could have been”是虚拟语气,但为什么要用被动语态呢?解释一下
解答:
这里不是被动语态,实际就是含有情态动词的there be结构。我们知道“情态动词+have done”,是表示过去的虚拟语气。所以,这里的there could have been,只是过去时态的虚拟语气。
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