"Kateřina a můj syn jsou přátelé."

Translation: Kateřina and my son are friends.

[Jelena482934]

Is přátele nominativ plural?

[VladaFu]

yes, you can often just check Wiktionary yourself:

https://en.wiktionary.org/wiki/p%C5%99%C3%A1tel%C3%A9

https://en.wiktionary.org/wiki/p%C5%99%C3%ADtel#Declension

[Cam31]

Would it be possible to include information about declension directly on the words in the course? It would certainly be helpful to see a new word or a word you're reviewing and include declension with its definition rather than have to look it up. Because as I'm sure you know, the definition only gets you so far

[nueby]

If your comment does not show up after you post it, please reload the page before trying again. That can help avoid duplicate posting.

In short, no. You are asking for a feature beyond what the individual teams can do. Duolingo's guidance is to refrain from including grammar information in the hover tips. Hover tips should only contain text directly corresponding to a possible translation, with the possible exception of optional portions in parentheses.

[Cam31]

Sorry, that was the first comment I made and it seemed to have disappeared after first posting it. It is unfortunate that it is beyond the Duolingo protocol, since when 1 English word maps to seven Czech words it seems incomplete to only identify the single translation. Oh well.

[dudeitszack]

Is there a difference between kamaradí and přatelé?

[VladaFu]

Přátelé is more formal, kamarádi is less.

In singular it is more complicated as přítel/přítelkyně can also mean boyfriend/girlfriend.

[pdusek]

Normally, especially in plural, I would translate "kamarádi" as "friends" and "přátelé" as "very good friends" (although the series "Friends" was translated as "Přátelé".). I agree with VladaFu that přítel is more formal.
But if used in singular, as Vlada mentioned too, it means almost always a boyfriend (přítelkyně would be girlfriend), used in informal language for almost all non-married people.