下面是出国留学网英语栏目为大家带来的“英语语法之虚拟句怎么用”，希望对大家有所帮助!
英语中，虚拟语气作为一种表示与事实相反的结构，除了用“动词原形”外，还可以用过去式表示。那么，在哪些情况下，虚拟句需要用过去时来表示呢?
一、用动词过去/过去完成时：
1. It is time that ...
It is time that children got up. 孩子们该起床了。
It is high time you left for Beijing. 你该离开去北京了。
2. I would rather...
I would rather you had left yesterday. 我宁愿你昨天就离开了。
Frankly, I would rather he was absent. 坦白讲，我宁愿他没在场。
3. If only...
If only I had enough money. 要是我有足够的钱就好了。
If only I had listened to my mother’s advice. 我要是之前听从妈妈的建议就好了。
4. as if/ though...
She ordered me as if she was my boss. 她支使我，好像是我老板似的。
She looked at me as though I was a monster. 她像看只怪物似的看着我。
5. I wish that...
I wish that I were a bird. 我希望自己是一只小鸟。
I wish that I hadn’t said that. 我真希望自己没那么说过。
二、用情态助动词过去时：
1. 用于条件句：
If I were you, I would not take part in this activity. 如果我是你，我不会参加这个活动。
If you should lend me the money, I should be much obliged. 如果你把这钱借给我，我会感激不尽的。
2. 用于含蓄条件句：
But for your help, I couldn’t finish the task.没有你的帮助，我就完成不了这项任务。
He who should violate the law would be punished. 违反法律的人，都要受到惩罚。
3. 其他语境：
I was shocked that she should forget me so quickly. 我很震惊，她竟然这么快就忘记我了。
因此，由上可知，如果该句叙述内容与事实相反，或有假设意义，且出现以上如“it is time that...”结构时，需要用动词的过去时或情态助动词的过去时来表示。
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