once = tan pronto
Once we had heard the results of the race, we wanted to celebrate.
Tan pronto que sepamos los resultados de la carrera, vamos a festejar la fiesta.
Once he had given up smoking, he put on 20 kg.
Tan pronto que dejó de fumar, engordó de 20 kilos.
She wanted to clean the kitchen once she had finished preparing lunch.
Una vez preparado el desayuno, quería limpiar la cocina.