Used to speculate on the present results of a hypothetical past situation/event. Can also be used to show regret or criticism.
3rd conditional (past perfect) 2nd conditional (would + infinitive)
If I hadn't been born in the Netherlands, I wouldn't be able to speak Dutch.
2nd conditional (past simple) 3rd conditional (would + have + pp)
If she wasn't so intelligent, she wouldn't have had such good grades.