Tom might have come to school in time for the lecture

Tom might have come to school in time for the lecture ---
A,if he got up earlier B,unless he had got up earlier C,but he got up very late D,but he had got up very late

当 might + 完成时 这种结构出现在句子中,就是虚拟句型,表达“不十分确定”的可能性：
如你提出的这条例句：Tom “有可能可以及时赶到学校 .
通常有两种最常见的搭配：
1）是“假如...”,这种情形必须是用过去完成时来体现.if he had got up early enough.
2）是“但是...”,这种就如你句子的答案,用简单过去时即可.but he got up late...
此种原则同样能在 would have / should have / could have 中应用,都属于虚拟.

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