If I + V-ed, I would …

结构︰

If…＋过去式动词…，主语＋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 <子句>中的<be><动词>，不论<主语>为第几人称，一律用 were，were 可置于主语前面，而省略 if。过去式<助动词>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<动词>原形结合起来构成<假设语气>。

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。