公本课堂：虚拟语气在条件从句和结果主句中的用法

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公本课堂：虚拟语气在条件从句和结果主句中的用法
1)表示与现在事实相反的条件和结果
从句：If＋主语＋动词过去式（be动词用were）  主句：主语＋should/would/might/could＋do  
如：If I were you，I should go and see the dentist at once. 假如我是你的话，我会马上去看牙科医生。
2)表示与过去事实相反的条件和结果。
从句：If＋主语＋had done   主句：主语＋should/would/might/could＋have done
如：If I had known of your arrival I should have met you at the station.如果我早知道你要来，我会去车站接你的。
3)表示与将来事实可能相反的条件和结果。其用法和表示与现在事实相反的条件和结果相同。
从句：If＋主语＋were to do/should do/动词过去式（be动词用were）
主句：主语＋should/would/might/could do
如：If it were Sunday tomorrow，my brother would go skating at the Beihai Park.如果明天是星期天，我弟弟会去北海公园滑冰的。