Unless I am mistaken, I've seen that man before.
- He visto a ese hombre antes, a menos que me equivoque.
You can't accuse him of stealing unless you have proof.
- No lo puedes acusar de haber robado a menos que tengas pruebas.
He never speaks unless spoken to.
- Ele nunca fala a menos que falem com ele.
There will be chaos unless we all adhere to the rules.
- Haverá desordem a menos que adiramos às regras.