得分类的!
与现在和将来的虚拟语气有关,与过去的虚拟语气没关系了.
1.主语是第一和三人称单数
当主语是第一和三人称单数时,实际口语使用中,If I/he/she was...远多于 If I/he/she were.
正式书面英语中,后者多于前者.
“如果我是一只老鹰”,可译为 If I was an eagle,.或 If I were an eagle,.口语中前者远多.但“如果我是你”这句具体的句子,却多译为 If I were you.
例子：
If I was to study at Oxford,I would be over the moon.
If she was to go to Oxford,she would have told me.
2.主语是第二人称,则用 were.
What would you do if you were President of America?
《张道真》的精华在虚拟语气,你自己去看吧.在这儿要跟你讲清楚得很大篇幅.