1.If you had been taller,you should have been a part of our school team.（虚拟语气,与过去相反.）
2.If I had known you bought so many gifts,I would have not bought them.（虚拟语气,与过去相反.）
3.The quality of our products is great.If they were to break down in a month ,we would exchange them freely.（虚拟语气,与未来相反.）
4.If you had had your medicine on time in the morning,you would not feel ache now.（混合虚拟语气）