英语虚拟语气

一、虚拟条件句：
条件状语从句是非真实情况，在这种情况下要用虚拟语气。
1．条件从句与现在事实不一致，其句型为：
句型1：If ＋主语＋过去时，主语＋ should (could, would, 或might) ＋动词原形
(1) If I were you, I would study hard.
(2) If it rained, I would not be here now.
2．条件从句与过去事实不一致，其句型为：
句型2：If ＋主语＋had＋过去分词，主语＋ should（could, would, 或might）＋ have ＋过去分词
(3) If the doctor had come last night, the boy would have been saved.
(4) If I had not studied hard, I would have failed in the exam last term.
3．条件从句与将来事实不一致，其句型为：
句型3：If ＋主语＋过去时/ should ＋动词原形/ were to＋动词原形，主语＋ should (could, would, 或might) ＋动词原形
(5) If it should rain tomorrow, we would stay at home.
(6) If I were to go to the moon one day, I could see it with my own eyes.
(7) If you missed the film tonight, you would feel sorry.
注意问题：
1．If条件句中绝对不可以出现would。
2．根据句中的时间状语，有时可能出现“混合虚拟”的情况，即主句可能是现在的情况，条件句也许是发生在过去的情况，但都要遵守上述句型。如：
(8) If you had studied hard before, you would be a college student now and you would graduate from a college in four years’ ti

不论主语为第几人称，if从句中的be动词均用were；主句中的助动词一定为过去时，且后面接动词原形

玩外文老百姓不懂。