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《Grammar and usage(1)： Unreal conditions》公开课PPT课件优质课下载
if 引导的虚拟条件句
① Unreal present 与现在事实相反
② Imaginary past 与过去事实相反
③ Imaginary future 与将来事实可能相反
虚拟语气在 if非真实条件句中
虚拟条件从句(If)
主 句
与现在事实相反的假设
与过去事实相反的假设
与将来事实相反的假设
主语+did/were
主语+should / would/could / might + do
主语+
had done
主语+ should /
would/ could /
might +have done
主语+did/should do/were to do
主语+should / would/could / might + do
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注意:1. if从句中，were，had（完成时态标志），should可以放在句首，（用于倒装结构），if必须省略。否定词not不能放在前面。
1.Had I not seen him then(Hadn’t I seen him then), I
wouldn't have been very happy.
2.If I were you, I would accept his advice.
3.If it rained/should rain/were to rain tomorrow, I would stay at home.