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虚拟语气在英语中也是比较基础的语法知识了，大家在学习英语的过程中都会碰到它。虚拟语气用来表达不可能或难以实现的愿望，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/ might + do (动词原形)
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 little earlier 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.
