Names, like all nouns in the language, have grammatical cases; that is, they change depending on their role in the sentence. For example, one would say "Pavel kouše sendvič" ("Paul bites a sandwich"), but "Pes kouše Pavla" ("A dog bites Paul") and "Pes ukousl Pavlovi prst" ("The dog bit Paul's finger off"). Unlike the very closely related Slovak language, Czech has a vocative case, a form of a word used only when calling or addressing someone. For instance, one would say, "Pavle, pozor pes!" (Paul, watch out for the dog!).