B1
If + S + had + V3, S + would have + V3
第三类条件句——对过去的遗憾
讲解
用于过去【没有发生】的事及其假想的后果。if 从句用过去完成时，主句用 would have 加过去分词。这是表达遗憾的方式。 常见陷阱：if 从句里【永远不用】would：If I would have studied ✗, If I had studied ✓。
例句
If I had studied, I would have passed.
如果我努力学习，就通过了。
She would have come if you had asked her.
如果你邀请她，她就来了。
If we had left earlier, we would not have missed the train.
如果我们早点出发，就不会错过火车了。
练习
通过选择题测试你的掌握程度
高效学习“If + S + had + V3, S + would have + V3”
语法点“If + S + had + V3, S + would have + V3”（第三类条件句——对过去的遗憾）是 CEFR 3 级别的重要结构之一。要熟练运用这个结构，你需要弄清楚它的使用语境，并经常练习。
学习小贴士：把例句大声朗读多遍，培养自然的语感反应。然后试着结合自己的生活情境造句。用发音按钮听标准发音并跟着练习。
你也可以查看完整课程“”，更深入地了解相关的语法和词汇。