I am sorry, that I interfere, but, in my opinion, there is other way of the decision of a question.
I think, that you are mistaken. I suggest it to discuss. Write to me in PM.
I apologise, would like to offer other decision.
Can be
I consider, that you are not right. I am assured. Let's discuss it. Write to me in PM, we will communicate.
I think, that you commit an error. I can prove it. Write to me in PM.
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I am sorry, that I interfere, but, in my opinion, there is other way of the decision of a question.
I think, that you are mistaken. I suggest it to discuss. Write to me in PM.
I apologise, would like to offer other decision.
Can be
I consider, that you are not right. I am assured. Let's discuss it. Write to me in PM, we will communicate.
I think, that you commit an error. I can prove it. Write to me in PM.