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IF 引导的虚拟语气.

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IF 引导的虚拟语气.
对过去,现在,未来的虚拟.的句型和特例.
1.对过去的虚拟
If you had taken my advice, you would have passed the exam.
从句用过去完成时,主句用would/should/could + have done
2.对现在的虚拟
If I was the master, I could find the problem.
从句用过去时态,主句用would/should/could + 动词原形
3.对将来的虚拟
If it rained tomorrow, we should cancell our trip.
从句用were/did/should,主句用should + 动词原形