Untitled

Third Conditional

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

It talks about the past. It's used to describe a situation that

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

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: