made a mistake
Someone made a mistake.
Ele cometeu um erro de propósito.
He made a mistake on purpose.
Um professor não deve rir de um aluno que cometeu um erro.
A teacher should not laugh at a student who has made a mistake.
Tom sabe que ele cometeu um erro.
Tom knows he made a mistake.
You made a fatal mistake.
Tom cometeu um erro grave.
Tom made a serious mistake.
She made a serious mistake.
Eu acho que você cometeu um erro.
I think you made a mistake.
He made a serious mistake.