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必修5《Grammar Summary》精品PPT课件优质课下载
如果我不嫁过来，我的夫君也不会死。
如果我的夫君不死，我也不会沦落到这么一个伤心的地方。
If +主 +had +过去分词, 主 +would/should/could/might + have + 过去分词.
If he had worked hard, he would have passed the examination.
如果他努力学的话，他就通过这次考试。
1.与过去事实相反的虚拟条件句
If + 主 + did(were), 主+would/should/could/might + 动词原形.
If I were you, I would try it again.
如果我是你，我会再试一次。
2.与现在事实相反的虚拟条件句
3.与将来事实相反的虚拟条件句
If he came here tomorrow, I would tell him about it.
如果他明天来的话,我会告诉他这件事.
If + 主 + did (were)/were to do /should do, 主+would/ should/could/might +动词原形.
如果他明天来这里，我就会告诉他。
虚拟条件句
主句
与过去事实相反
与现在事实相反
与将来事实相反
If+主语+had done
主语+ would/ might/ could/ should
have done
If+主语+did
（动词be用were)