if虚拟语气英语

if的虚拟语气用法分为三种：对过去语气的虚拟，对现在语气的虚拟，对未来语气的虚拟。if虚拟语气的基本准则就是把时态向前推一次。

对过去语气的虚拟：主句would/could/should/might +have done，从句if+主语+had done

对现在语气的虚拟：主句would/could/should/might +do，从句if+主语+was/were

对将来语气的虚拟：主句would/could/should/might +do，从句if+should do/if+were to do/if was/were

掌握好虚拟语气的用法对高中的学习生活有很大用处。

例：If I were a bird,I would fly above the ocean. If I were to obtain the gift,I would appreciate it a lot.