Como expliqué en otro artículo, el tercer condicional habla de situaciones hipotéticas en el pasado. Por lo tanto, son imposibles ahora—se trata de cosas que pasaron (o que no pasaron) pero siempre en el pasado.
Eso se diferencia del primer condicional y el segundo condicional, que se tratan de cosas más o menos probables ahora y en el futuro.
Primer Condicional: If I see her, I’ll tell you. (probable)
Segundo Condicional: If I saw her, I’d tell you. (menos probable)
Tercer Condicional: If I had seen her, I would have told you. (no la vi)
El tercer condicional se forma por un lado con if + past perfect y por el otro con would have + past participle.
1. If she had been there, I would have seen her.
2. If we had had more time, we would have visited Pompeii.
3. If I had studied more, I would have passed the exam.
4. If I had been able to afford it, I would have bought the Porsche.
5. If Bill had arrived earlier, we wouldn’t have missed the train.
6. If I hadn’t lost my keys, we would have been able to get in the house.
7. If they hadn’t told me about the exhibition, I never would have known.
8. If I hadn’t gone to the concert, I would never have met Sylvia.
9. If you had answered the phone, I would have told you the news.
10. If she had been friendlier, she wouldn’t have offended anyone.
Eso es, espero que lo hayas disfrutado!
Puedes escuchar estas frases en mis audios en SoundCloud: 10 Ejemplos del Tercer Condicional