Usages of certificar-se de
Antes de entrar num prédio inexplorado, certifico-me de que não há perigo.
Before entering an unexplored building, I make sure that there is no danger.
Convenci-me de que a porta estava trancada, mas certifiquei-me de que podíamos sair.
I convinced myself that the door was locked, but I made sure that we could leave.
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