2.用法
与现在事实相反的假定。如:
If the sun stopped radiating heat and light, life on earth would be impossible.
如果太阳停止放射光和热,地球上的生命就不可能生存。
If I were you, I should start packing now.
如果我是你,我现在就动手收拾行装了。
与过去事实相反的假定。如:
If you had started your work earlier, you would have finished it.
如果当时你早点开始工作的话,你早就把工作完成了。
He would have succeeded in the Sydney Olympic Games if his courage hadnt failed him.
如果他不是当时一时胆怯,他就会已经在悉尼奥运会上获胜了。
推测未来不可能实现或实现可能性很小的假定。如:
If the director came tomorrow, I would tell him about our proposal.
如果主任明天来,我将把我们的建议告诉他。
If I should live in the twenty-second century, I would spend my vacation on the moon.
如果我生活在二十二世纪,我将在月球上度假。
What would you do if war were to break out?
如果战争爆发,你怎么办?
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