"Do you not see a cat?"

Translation: Nevidíš kočku?

[PhilCostin]

I thought it might be kočka, since kočku would be accusative, would it not?

[BoneheadBass]

It is "kočku" (in the accusative, as you said), because it is the direct object in this sentence.

[A1aT4]

Can't it be both nevidíš And nevidíte?

[endless_sleeper]

Yes, both are accepted. Nevidíte is singular formal and plural ;)

[ColinSheaff]

I wrote 'nevidiš kocour' and was marked incorrect. Not sure how many 'cat' alternatives to accept, but I was mildly annoyed.

[Jamie08MD]

"Kocour" is fine, it's a male cat, but you need it in the accusative for this sentence to be correct. -> "Nevidíš kocoura."

[Steffen870754]

Here in Duolingo is both of them correct: Nevidíš kočku and Nevidíš kočka. I have thought, only kočku is correct = Akkusativ. ??

[BoneheadBass]

There is no acceptable translation for this sentence that uses kočka. Perhaps it was a Duo hiccup if it showed you one.