1. I´d rather you not mention that
Only the second sentence is correct provided you put a full stop at the end. It means: My preference is that you don't mention that. CB
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Only the second sentence is correct provided you put a full stop at the end. It means: My preference is that you don't mention that.
CB
Both sentences require ending punctuation. They mean that I don't want you to talk about that subject. Usually it refers to telling someone else.