did it
Ich glaube, dass er es getan hat.
I believe he did it.
Ich weiß nicht, wer es getan hat.
I don't know who did it.
Jeder weiß sicher, dass er es war, der es getan hat.
Everyone knows for sure that he was the one who did it.
We know who did it.
Ich hätte wissen müssen, dass Tom es getan hat.
I should have known that Tom did it.
Tom weiß, wer es getan hat, aber er will es niemandem sagen.
Tom knows who did it, but he doesn't want to tell anyone.