"On pani nie pamięta."

Translation: He does not remember you.

[mgaristova]

I guess the Genitive here is used because of the negation.
The positive would be "On pamięta panią".
Am I right?

[Jellei]

Perfectly right. Or "on panią pamięta".

[Zed895]

Pani means lady so I wrote this: 'he does not remember her' and it is wrong. Why?
Thanks

[Jellei]

In such a phrase, although it is 3rd person singular, it is in fact the formal 'you'. It's not some lady who is not remembered, it's 'you'. The closest translation would be "He doesn't remember you, madame".

"On nie pamięta tej pani" would be in fact "He doesn't remember this lady", but if there isn't any demonstrative pronoun or something similar ("On nie pamięta żadnej pani" = He doesn't remember any lady) that means it is the formal singular 'you'.

[Mim_Fox]

"He doesn't remember you, madame" is not accepted though.

[Jellei]

That's... unexpected. It obviously should have been accepted... Added now.

[WalterKomo]

Why is "he's not remembering you wrong", is that a different verb

[Jellei]

"to remember" is a stative verb, those aren't really used in Present Continuous much...