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第三条件句(If + 过去完成时, would have + 过去分词)讲述一个不真实的过去情况及其想象中(但现在不可能实现)的结果——常用于表达遗憾。
If I would have known, I would have told you.
If I had known, I would have told you. — "if"后面用过去完成时,不用"would have"。
If I had studied, I would pass.
If I had studied, I would have passed. — 结果分句中用"would have + 过去分词"。
had known
wouldn't have been