you're wrong
I’ll prove that you’re wrong.
Миша, не перебивай меня, я хочу сказать на счёт Димы ты не прав.
Misha, don’t interrupt me. I want to say that you’re wrong about Dima.
— Radio Day (2008)
I think you're wrong.
In my opinion, you are wrong.
Ну, за это попадёт нам обоим, если ты не прав.
Well, we'll both be in trouble for this if you're wrong.
— Крепкий орешек (1988)
I suspect you're wrong.
I'm afraid you're wrong.