you're 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’ll prove that you’re wrong.
I think you're wrong.
Я знаю, что очень маловероятно, что я смогу убедить тебя, что ты не прав.
I know it's very unlikely that I'll be able to convince you that you're wrong.
I'm afraid you're wrong.
I think you're wrong.
I suspect you're wrong.