The Third Conditional

The third conditional is used to refer to a time that is “in the past”, and a situation that is “contrary to reality”. The facts they are based on are the opposite of what is expressed. The third conditional is used to refer to an unreal past condition and its probable past result. In third conditional sentences, the if clause uses the past perfect, and the main clause uses the perfect conditional.

IF CLAUSE	MAIN CLAUSE
If + past perfect	perfect conditional or perfect continuous conditional
If this thing had happened	that thing would have happened. (but neither of those things really happened) OR that thing would have been happening.
If you had studied harder	you would have passed the exam.
If it had rained	you would have gotten wet.
If I had accepted that promotion	I would have been working in Milan.

Third Conditional (Structure)

More examples:

• If I had won the lottery, I would have traveled around the world.
  Si yo hubiera ganado la lotería, habría viajado por todo el mundo.
• If I had seen him, I would have told him about you.
  Si lo hubiese visto, le habría contado acerca de ti.
• If I had known the answer, I would have raised my hand.
  Si hubiese sabido la respuesta, habría levantado mi mano.
• If she had come on Saturday, I would have seen her.
  Si ella hubiese venido el sábado, la habría visto.
• If they had left earlier, they would have arrived on time.
  Si ellos hubiesen salido más temprano, habrían llegado a tiempo.
• If we had studied harder, we might have passed the test.
  Si hubiésemos estudiado más duro, podríamos haber aprobado la prueba.
• If you had gone to Brazil, you would have had lots of fun.
  Si tu hubieses ido a Brasil, habrías tenido mucha diversión.
• If I hadn't been so busy, I could have helped you.
  Si no hubiese estado tan ocupado, te podría haber ayudado.

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http://www.englishexercises.org/makeagame/viewgame.asp?id=3233#a