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Third Conditional Explanation With the third conditional we talk about the past. We talk about a condition in the past that did not happen. If

+ Past Participle(had or hadn't) "," + Would(not) have + verb in participle

If I had gone to school , I would have understood it. If I hadn't gone to school , I wouldn't have understood it. Would(not) have + verb in participle + If

+ Past Participle(had/hadn't)

I would have understood it if I had gone to school. I wouldn't have understood it if I hadn't gone to school.

third conditional structure explanation  

third conditional structure explanation