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Tom might have come to school in time for the lecture ---

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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
Tom might have come to school in time for the lecture ---
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.