这句错综时间条件句的原句怎么说?If he had perpared well for his lessons yesterday he wouldn't have so many difficulties now.在学虚拟语气额,看到这句例句有点不懂,这句哪里产生了时间的错综啊?原句如果表达

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这句错综时间条件句的原句怎么说?
If he had perpared well for his lessons yesterday he wouldn't have so many difficulties now.
在学虚拟语气额,看到这句例句有点不懂,这句哪里产生了时间的错综啊?原句如果表达这个意思那该怎么说啊?
这句话不是被虚拟了吗？本身是不存在的情况。如果按照一般的状况，不虚拟，那这句句子表达这个意思应该怎么写？
还有，书上对这个例句的翻译是：如果他昨天就把功课都预习好了的话，他现在不会有这么多难题。是不是这里的从句“ If he had perpared well for his lessons yesterday 不调整时态之前应该是“If he perpared well for his lessons yesterday”。这样才产生了时间的错综。

就是说“如果昨天他有预习课文,现在就不会有那么多难点了”.所以说,他昨天是没有预习的,所以现在就有很多问题.虚拟在,“有复习”这个点上,是跟事实相反.
这个是虚拟中的过去与现在的虚拟,我们老师叫它“混虚”.

呃，我好久没学了，是后半句，他说now了，但还是在用would，would是will的过去式啊，我觉得这个句子对的啊，哪有原句啊，不知道的加365777157，

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