a no ser que no vengas, iré a la fiesta (Double negative problem) Please can someone explain the double negative in English? I am not sure if this means : Unless you come, I will go to the party (with you) Unless you come, I won't go to the part (with you) Only if you come I will go to the party (with you) Only if you don't come, I will go to the party ( without you) How do I say Unless you come, I will go to the party with you and Only if you don't come, I will go to the party using a no ser que