英语动词有三种语气， 陈述语气，祈使语气和虚拟语气。 定义：用来表示说的话不是事实，或者是不可能发生的情况，而是一种愿望，建议，假设的语气叫虚拟语气。条件从句 If 从句的谓语形式 主句的谓语形式现在过去时（were ）Would/could/should/might +V. （原）过去过去完成时Would/could/should/might+have+p.p.未来1.过去时2.should+V.3. were to dowould/could/should/might +V. （原）一：虚拟语气在条件状语 从句中的用法1.If I had HIV, I would know because I would feel sick.2.If I were you, I would give AIDS patient a hug.3. If I had taken your advice, I wouldnt have made a mistake.4. If he had been there, it wouldnt have happened.与现在事实相反与过去事实相反5.If i
