状语从句中虚拟语气用法ABC

南昌十九中  宋焘

虚拟语气最多地用在表示条件的状语从句和表示结果的从句中。在表示与事实相反的虚拟语气时，动词有三种时态形式，即现在、过去和将来。
A．与现在事实相反：
If I (we,you,he,they)+ 动词过去式    I (we) should/would/could + 动词原形。

If I were you, I should buy it.
如果我是你，我就买了它。
If I had time, I would study French.
如果我有时间，我会学习法语的。

B．与过去事实相反：
If I(we,you,he,they)+ had + 过去分词    I(we)should /would/could+ have+ 过去分词。

If she knew English,she would not ask me for help.
如果她懂英语的话，她不会找我帮忙的。
If you had got up earlier, you could have caught the train.
如果你早一点起床，就会赶上火车的。

C.与将来事实相反

If I (we,you,he,they)+ 动词过去式..   I (we) should + 动词原形。

If it were fine tomorrow,I would go shopping.
如果明天天气好，我就去买东西。
***有关虚拟语气的几个问题***
1) 有时if引导的状语从句可以省略 if，而把从句中的动词 were, had 或 should 移到主语前面。
Were she younger, she would do it .
如果她年青点， 她就会干的。
Had he known her address, he would had gone to visit her.
如果他知道她的地址，他会去看她的。
2) 有时表示虚拟语气的条件从句或者主句都可以省略，而只剩下一个主句或者一个条件从句。
I could help you. 我本来可以帮助你。
If I had time. 我要有时间该多好啊！
She should have come to the party. 她应该来参加聚会。
3) 虚拟语气中，条件从句的动词动作可以和主句的动词动作时态不一致。
If they had studied hard, they could do it easily now.
如果他们以前努力学习的话，现在干的就会容易些。
If he had not taken my advice, he wouldn't do it much better like this.
如果他不听取我的建议，他就不会干得这样好。