would have done it
Lo habría hecho si hubiese sabido que era necesario.
I would have done it if I had known it was necessary.
Yo lo habría hecho de otra forma.
I would have done it differently.
No sé si él lo habría hecho por mí.
I don't know if he would have done it for me.
No sé si lo habría hecho por mí.
I don't know if he would have done it for me.
Si fuera tan fácil como dices, ya lo habría hecho.
If it were as easy as you say, I would have done it already.