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IF从句 举例子内容 从句 主句与现在事实相反 动词过去式(be用were) would/could/should/mi

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IF从句 举例子
内容 从句 主句
与现在事实相反 动词过去式(be用were) would/could/should/might+动原
与过去事实相反 had+动词过去分词 would/could/should/might+have+动分
与将来事实相反 should/were to+动原 would/could/should/might+动原
各举
1.If I were a bird,I could fly high in the sky.
2.If I had been careful,I would have passed the examination.
3.If I were to be a bird,I might fly away from my house.