Why is it not 'tamten psa'? Isn't it accusative here since it's not a negative question?
There's no such thing as tamten psa.
- Tamten pies: Tamten pies jest ładny; tamten pies jest mój
- Tamtego psa: Widzę tamtego psa; znam tamtego psa
Pronoun's case has to match noun's case. Pies is in accustive (psa) and accusative of temten is tamtego.
In exercises where you tap/click the words to make the sentences, do you ever actually use 'Nom.', 'Acc.', 'pl.' etc.? Because it just seems like they're taking up space on the screen.