一、与过去事实相反的虚拟语气
从句
主句
if＋主语＋had＋过去分词
主语＋should/would/could/might have＋过去分词
如：If the weather had been nice yesterday, we would have gone for a picnic.
如果昨天天气好的话，我们就去野餐了。
If you had come earlier, you could have caught the bus.
如果你早一点儿来的话，你就能赶上公交车了。
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