"Chcę tańczyć z wami!"

Translation: I want to dance with you!

[King2E4]

Why is "zatańczyć" (the Perfective) not used here?

[Jellei]

As far as I see, Perfective is introduced in the same row as Pronouns 2, from which this sentence comes. So it was impossible to use here. This focuses on the 'process' of dancing and not dancing a particular dance, seems perfectly acceptable, although probably worse, true.

Anyway, added "zatańczyć".

[ijbrito]

wami = singular?

[Jellei]

No, plural. Which I guess in this sentence is a bit surprising.

[MarkKulka]

Yes, with all of you!

[SashaKW]

This is instrumental? How come?

[JerryMcCarthy99]

Well, according to https://www.clozemaster.com/blog/polish-prepositions/ , "z" in this usage (with) takes instrumental (albeit genitive in other usages).