you're wrong
Si lo piensas un poco verás que estás equivocado.
If you think about it for a bit, you'll see that you're wrong.
No solo estás equivocado tú, sino yo también.
Not only are you wrong, but so am I.
Estás equivocado respecto a eso.
You're mistaken about that.
Si estás equivocado, entonces yo también lo estoy.
If you're wrong, then I am too.
It seems like you're mistaken.
I think you're wrong.
Sin querer ser grosero, creo que estás equivocado.
Without meaning to be rude, I think you're wrong.
I think you're mistaken.
Me parece que estás equivocado.
I think you're mistaken.
Estás equivocado, eso no fue lo que pasó en realidad.
You're wrong, that's not what actually happened.