guaranteed, assured
Eu garanti a Tom que eu não faria isso nunca mais.
I assured Tom that I would never do that again.
Garanti que ninguém estava vendo.
I made sure no one was watching.
Perguntou se o pessoal da nave estelar tinha me machucado, e garanti que não.
They asked if the people on the starship had hurt me, and I assured them they hadn’t.