Let's see if I understood:
The verb "have" needs accusative, if it's not negation?
That's one of the most serious problems with the TTS voice. It's just totally wrong here. Nothing we can do about it :|
This lesson contains both the following sentences: "Mam jej psa" and "Mamy ją!"
If jej is genitive, shouldn't it be "Mam ja psa" instead of "Mam jej psa"?
No, "I have a dog" means "Mam psa" or "Ja mam psa". When you want to say "I have her dog" then correct version is "Mam jej psa" or "Ja mam jej psa"
"I have her" vs "I have her's", the latter being totally not awkward in Polish. "You have her sweater?" ENG: I have it. POL: I have her's (mam jej).
Totally not awkward? I mean, that seems possible and technically correct, but rather weird, actually.
Oh, also it's "hers", not "her's".
I think part of the confusion here is that apparently the third person possessive pronouns are not declinable (https://en.wiktionary.org/wiki/jej#Polish). In other words "jej" is already the genitive (possessive) form of ona and doesn't match the noun like an adjective would. Literally it's "dog of hers."
I would advice to call them possesive, and not genitive. nouns in genitive when they indicate possesion, are alvays after the noun they describe, while pronouns are before. Also jej and ich are one of two possible genitive forms, and jego is one of three possible genitive forms. But there is ony one version of respective possessive pronouns. ( dla niej , dla jej psa/ do niego, do jego domu, nie widzę go, nie widzę jego psa/ do nich, do ich domu)
jej pies/ pies Kasi
Maybe because its not genitive in the case of the "her" bit. You're not being possessive of her, youre being possessive of her DOG. and so it remains as jej?
Actually, 3rd person possessives (jego = his/its, jej = her, ich = their) just stay the same in every case. One thing less to learn :)
But if it would be another possessive, it would have to use Accusative. Or rathre, it already does, you just don't see it. Because this is what is used: a possessive + a noun is a noun phrase, and as you 'have the noun phrase', the noun phrase uses Accusative. Just as simple 'Mam psa'.
To jest jej pies (Nom). / Mam jej psa (Acc). / Nie widzę jej psa (Gen.) / Reks jest jej psem (Instr.) And other cases as well, but I guess these are those that you're familiar with right now :)
Why jej instead of ją? Which form is jej? Is it genitive? Why are we using genitive here? I don't get itb