We use the 3rd conditional when we talk about the past.
"If I had done something, things would have been different."

In your if clause, use the past perfect
• had done
• had studied

In your main clause, use would + present perfect:
• would have been
• would have passed

Try it!

Fill in the correct form.

If we had studied together, I would have passed.
PASS

1. If you had bought ice cream, I harder.
STUDY

2. If the teacher had made an easier exam, my grade out better.
TURN

3. If the school had been closed, I at home and skipped the exam.
STAY

4. If I had known all the questions beforehand, the test easier for me.
BE

5. If all my classmates had helped me, I the best student in class.
BECOME