had seen
I hadn’t seen him here before.
Tom estava impressionado com o que tinha visto.
Tom was impressed by what he had seen.
Tom me contou tudo o que tinha visto.
Tom told me everything he had seen.
Tom disse à Mary que ele tinha visto John em Janeiro.
Tom told Mary that he had seen John in January.
Achei que tinha visto uma macieira no vale.
I thought I saw an apple tree in the valley.
— A Bruxa (2016)
Você já tinha visto um filme tão maravilhoso antes?
Have you ever seen such a wonderful movie before?