Second Conditional 

Refiere a una situación hipotética y se forma según la estructura if + simple past + simple condicional. Aquí tienes algunos ejemplos traducidos.

If clause	Main clause
If + Past Simple	would / could / might + verb
If I won the lottery,	I would travel around the world.

If I were in Brazil, I would go to Rio de Janeiro.
Si yo estuviese en Brasil, iría a Río de Janeiro

If I were you, I would buy that car.
Si yo fuese tú, compraría ese auto.

If he were in my place, he wouldn't do this.
Si él estuviese en mi lugar, no haría esto.

If I had more money, I would buy a nice apartment.
Si yo tuviese más dinero, me compraría un lindo apartamento.

If she had more time, she would travel more often.
Si ella tuviera más tiempo, viajaría más a menudo.

If it were not raining, we could go out.
Si no estuviese lloviendo, podríamos salir

If we didn't have to work today, we could have a picnic.
Si no tuviésemos que trabajar hoy, podríamos tener un picnic

If they won the lottery, they wouldn't work any more.
Si ellos ganaran la lotería, no trabajarían más.

If I saw her, I would ask her out.
Si la viera, la invitaría a salir.

If you went to Brazil, you wouldn't want to come back.
Si fueras a Brazil, no querrías regresar.

If they spoke Spanish, we would understand them.
Si ellos hablasen español, los entenderíamos.

If he didn't live by the river, he couldn't go fishing.
Si el no viviera cerca del río, no podría ir a pescar

If I didn't want to go, I would tell you.
Si no quisiera ir, te lo diría.