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    If I + V-ed，I would ……

    结构︰If…＋过去式动词…，主词＋过去式助动词（would/should 等）＋原形动词

    说明︰这是与现在事实相反的假设句型。if中的，不论为第几人称，一律用were，were可置于主词前面，而省略if，过去式除用should（用于第一人称）、would（用于第二、三人称）外，还可用不分人称的could，might和ought to，它们与原形结合起来构成。

    If I knew his address,I could write to him.如果我知道他的住址，我会写信给他。

    If I were free now,I might call on him.如果我有时间，我可能会去看他。

    If you were in my shoes(=Were you in my shoes),what would you do?

    如果你站在我的立场，你会怎么做？

    Were I rich enough,I would buy a sports car.如果我有足够的钱，我就买一辆赛车了。

    How happy I would be if I were a few inches taller!要是我再高几寸，我会好高兴。

    If I had a car,I could take her for a drive.如果我有车，我就带她去兜风了。

    If I had binoculars,I could see that comet clearly.

    如果我有望远镜，我就可以清楚地看见那颗彗星。