这句话时态不对吧?they must have been several hundred people present

来源：学生作业帮编辑：百度作业网作业帮分类：英语作业时间：2024/08/16 03:24:05

这句话时态不对吧?
they must have been several hundred people present just before the show began.
后面那句是过去时,但是前面那句是现在完成时,连着现在的,怎么可能before?

我觉得没错（除了they应该是There）,对过去事实的判断,用must have done应该是符合语法的,虽然事情是以前的,但“判断”这个动作是说话的时候做的,“一定有几百人是在展会开始之前到场的”.站在现在的角度对展会开始之前的情况作判断,能理解吧?
再问：你画一个时间轴。（现在）一定有几百人了在展会开始（过去）之前。现在在过去之前？
再答：这个上面不太好画图，这样说吧：动词用什么时态，要看它的主语处在什么时候做的这件事，对吧？虽然几百人到会这件事是发生在过去的，但“must”（肯定）这个动作是说话时做的，也就是一个判断的动作（姑且把判断也理解为一个动作），所以不用变（其实must 也没有过去式），但由于判断的事在过去，所以不说must be，而说must have been。这个是有点绕，我举个简单点的例子吧： I believe that he killed her. 你不觉得有错吧？ I believe that he had killed her before you arrived here. 也没错吧？两句说的都是过去的事，但判断都是做的，所以主句动词believe不用变。

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