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If I were,I would have....虚拟语气
与事实相反的假设，通常分为基本的三种形式。
1)与现在事实相反的虚拟：
If + did / were + ..., ... would
should
could + do （动词原形）
might
If I were you, I would go abroad at once. (I am not you.)
If he knew it now, he could help me. (He doesn't know it now.)
2)与过去事实相反的虚拟：
If + had done + ..., ... would (might) have done ...
If I had known your telephone number yesterday, I would have phoned you.
(I didn't know your telephone number.)
If you had come here a littleearlier just now, you might have met her.
(You didn't come here earlier.)
3)与将来事实相反的虚拟：
(1) If + should + v., ... would + v.
（可能性很小）（译作“万一”）
If it should rain tomorrow, you could stay at home.
If I should fail, what should Ido?
(2) If + did / were to + v ..., would + v.
（完全不可能）
If the sun were to rise in the west, I would lend you the money.
If you finished it in 3 minutes, I would give you my car.
