英语中的虚拟语气有什么用法呢？

Question

如题所述

Answer 1

1. 与现在事实相反：
Without air, man couldn't exist on the earth.
没有空气的话，人类将不能在地球上生存。

谓语动词：would/could/might (not) do sth.

2. 与过去事实相反：
Without your help, I would have failed the exam last week.
没有你帮助的话，我上周考试可能就通不过了。

谓语动词：would/could/might (not) have done sth.

3. 与将来事实相反：
Without your ticket, I wouldn't be able to go to the concert tomorrow.
要是没有你的票的话，我明天就不能去听音乐会了。

谓语动词：would/could/might (not) do sth.