was sure
Tom no estaba seguro.
Tom wasn't sure.
Él tenía fe en su astucia, y estaba seguro que encontraría al ave.
He had faith in his cleverness, and was sure he would find the bird.
No estaba seguro de si volverías o no.
I wasn't sure whether you would come back or not.
— Happy together (1997)
Yo no estaba seguro de lo que se supone que debía hacer.
I wasn’t sure what I was supposed to do.
Él sentía, en realidad estaba seguro, que Syed, también tiene estreñimiento.
He felt—actually, he was sure—that Syed was constipated too.
— पीकू (2015)
Tom estaba seguro que nunca más la volvería a ver.
Tom was sure he would never see her again.
I knew I was safe.