litewskiego

In a sentence

• Czy znasz historię litewskiego języka?

  Do you know the history of the Lithuanian language?

  Here, 'litewskiego' is used as an adjective in the genitive case to describe 'języka' (language), illustrating its function in specifying the type of language.

• Mam przyjaciela mówiącego po litewsku, który uczy się polskiego.

  I have a friend who speaks Lithuanian, who is learning Polish.

  In this sentence, 'litewskiego' does not appear directly; instead, the base form 'litewski' is in use as 'po litewsku' (in Lithuanian). It shows the adverbial application of the word.

• Potrzebuję słownika litewskiego, choć bardziej interesuje mnie polski.

  I need a Lithuanian dictionary, though Polish interests me more.

  Here, 'litewskiego' describes the kind of dictionary ('słownika') in the genitive case, indicating a possession or relation to the Lithuanian language.