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The Third Conditional

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:

if + past perfect, ...would + have + past participle

It talks about the past. It's used to describe a situation that didn't happen, and to imagine the result of this situation.

Example:

If she had studied, she would have passed the exam (but, really we know she didn't study and so she didn't pass)