you say you know what the sentence means

[GoldfishLord]

You are still trying to find the exact meaning of words in terms of other words. This seems to be a pointless exercise - you say you know what the sentence means. That is the important thing.

What's the reason "say" is in the present tense?
What's the reason "say" was used instead of "said"?

 

[Piscean]

In an earlier post in the thread you quoted from, you wrote "I know what that sentence means".

I chose to present this as an ongoing truth rather than locating the act of saying in past time. I could have said You said you know what the sentence means or You said you knew what the sentence meant. There is no significant difference in meaning.

 

[Holmes]

i chose to present this as an ongoing truth rather than locating the act of saying in past time.

Another factor which I think warrants the use of the present tense in this case is that the saying occurred in writing. We commonly reference written assertions in the present tense: (pointing to a written document or post) "You say, right here and right here, that you know what the sentence means."