语法补充讲义一(虚拟语气1)

语法补充讲义一：虚拟语气1 虚拟条件句

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一、虚拟条件句的类别

虚拟条件句可分为三类：

●叙述与现在事实相反的情况

●叙述与过去事实相反的情况

●叙述与将来事实相反的情况。

详细说明：

1. 与现在事实相反

条件从句用过去时（be动词的过去式一律用were），主句用would （should/ might / could）+动词原形”。如：

If I were you, I would accept the invitation to the party.

如果我是你的话，我将接受去舞会的邀请。

If I knew her well, I would tell you about her.

如果我很了解她的话，我将告诉你关于她的事情。

2. 与过去事实相反

条件从句用过去完成时，主句用“would /should/ might / could + have +过去分词”, 如：

If you had been there last night, nothing would have happened.

如果你昨天晚上在那儿的话，就没有什么事情发生了。

If I had got up earlier, I would have caught the first bus.

如果我起得更早一些的话，就赶上头班车了。

3．与将来事实相反

条件从句用过去时或者“were to + 动词原形”或者“should+ 动词原形”，主句用“would （should/ might / could）+动词原形”, 如：

If it were Saturday tomorrow, we wouldn’t have an exam.

如果明天是周六的话，我们就不考试了。

If you were to visit the school tomorrow, you would see Professor Smith.

如果你明天去参观学校的话，你就会看到史密斯教授。

If it should rain tomorrow, the sports meet would be put off until next Friday.

如果明天下雨的话，运动会将被推迟到下周五举行。

归纳：

在虚拟条件句中，谓语动词按照“后退一步法”使用，即：与现在事实相反，从句中用一般过去时；与过去事实相反，从句中用过去完成时；与将来事实相反，从句中用过去将来时。

二、虚拟条件句中的省略与倒装

如果if虚拟条件句中有were, had, 或者should等词时，可以省略if，把这些词放在主语前，形成倒装句。如：

If I should meet her (Should I meet her), I would tell her.

如果我遇见她的话，我就告诉她。

If I were in your position (Were I in your position), I would do it better.

如果我在你的位置上，我会做得更好。

If they had made preparations (Had they made preparations), they would have succeeded.

如果他们做了准备的话，他们就已经成功了。

三、练习：

（一）、动词变形

用所给动词的适当形式填空。

1. —¬ If the factory ___________ (belong) to me, I ___________ (not sell) it.

—But it isn’t yours.

2. — If you ___________ (keep) the secret, nobody ___________ (know) it.

—I’m sorry for making such a mistake.

3. If the weather were to be (be) fine tomorrow, I ______ (go) for an outing with my parents.

4. ___________ (be) I you, I would think about this problem once again.

5. ___________ (have) I had time last night, I ___________ (go) to see this wonderful film.

（二）、完成句子

根据中文提示完成下列各句。

1. 如果你年轻五岁，你该怎么办？

What ___________ you ___________, if you ___________ five years younger?

2. 如果你开车更小心一点，就不会出这样的事故。

If you ______________________ your car more carefully, such a traffic accident _________________________________.

3. 如果明天下雾，我就不能开车去购物。

If it ___________ foggy tomorrow, I ______________________ my car to go shopping.

4. 如果明天天气转晴，我们就去野餐。

If it ______________________ clear up tomorrow, we ______________________ for a picnic. 5. 如果我是一个男孩，我当然会去参军。

If I ___________ a boy, I ___________ certainly join the army.

6. 如果你是我兄弟，你也会一样对我。

If you ___________ my brother, you ___________ treat me in the same way.

7. 如果我有你这样的姐姐会非常幸福的。