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人教2003课标版《Structures in Use、Grammar in Use》集体备课PPT课件优质课下载
三
if引导的虚拟条件句
时间 从句动词 主句动词
现在 一般过去时 would/should/could/might + 动词原形
（be用were）
过去 had done would/should/could/might + have done
将来1. 一般过去时
（be用were） would/should/could/might + 动词原形
2. should + do
3. were to + do
1. 如果我是只鸟，我就会飞到你身边去。
If I were a bird, I would fly to you.
（虚拟现在）
2. 如果我们早一点动身的话，就不会误车了。
If we had started earlier, we should not
have missed the train.
（虚拟过去）
3.如果没有空气，就不会有生物。
If there were no air, there would be no living things.
（虚拟现在）
4.如果李教授明天有空的话，我们可以问他点问题。
If Professor Li should have time tomorrow, we could ask him some questions.
（虚拟将来）
5. 如果有一天我去了月球，我就能亲眼看到它了。
If I were to go to the moon one day, I could see it with my own eyes.