The Third Conditional - Perfect English Grammar
www.perfect-english-grammar.com › thirdPerfect English Grammar. We make the third conditional by using the past perfect after 'if' and then 'would have' and the past participle in the second part of the sentence: It talks about the past. It's used to describe a situation that didn't happen, and to imagine the result of this situation. If she had studied, she would have passed the exam (but, really we know she didn't study and so she didn't pass)