had changed
Eu devia ter me perguntado por que tinha mudado de atitude.
I should have asked myself why I had changed my attitude.
Nenhum de nós poderia entender o que tinha mudado nele.
None of us could understand what had changed in him.
— Viver (1952)
O Tom tinha mudado tanto que eu nem o reconheci.
Tom had changed so much that I didn't even recognize him.
O Sami disse que tinha mudado.
Sami said he had changed.