"Oni nie są parą."

Translation: They are not a couple.

[Dedumdadum]

Is this the instrumental case? And if so, this is a feminine couple/pair?

[Jellei]

Yes, it's Instrumental. The word "para" (couple) is feminine no matter who is a part of this couple.

[Dedumdadum]

Thanks!

[JanKLinde]

If they were both female, the subject pronoun would be "one".

[v.Baltic]

Pair isn't working

[Jellei]

I still can't believe that English can use "pair" about people, but apparently it can. OK, added.

[JHeaven]

Usually it's with the indefinite article, "a pair" e.g. they are a pair. = they are a couple.

[Pete_Sr]

Why isn't this genitive? Isn't it a negative construction?

[JanKLinde]

Only accusative changes to genitive when it's negated. All the other cases (here: instrumental) remain unchanged.

[kermodii]

I've seen cases where "They are not couples" work as well, think it could be added?

[alik1989]

We believe that the Polish sentence only refers to one couple. Otherwise it would be phrased differently.

I personally also have doubts about whether 'They are not couples' is a common thing to say in English. The iweb corpus returns 68 results for _pp are not a couple, but none for _pp are not couples (the two contexts that do show up refer to a company called 'Couples').

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https://www.english-corpora.org/iweb/

[JanKLinde]

It might be said while talking about at least four people: "What about Frank and Sue or Bob and Jane?" "They are not couples." But that's a rather rare exception...

[Jellei]

And it would definitely be plural in Polish as well ("Oni nie są parami").

[kermodii]

An oversight on my part, the plurals are definitely still a head scratcher for me.

[aKsXl]

polak wegier dwa bratanki