In Croatian grammar, auxiliary verbs are used to help form the various tenses, moods, and voices of other verbs. They play a vital role in expressing specific actions, events, or meanings in a sentence. Some of the common auxiliary verbs in Croatian are “biti” (to be), “htjeti” (to want), and “moći” (can). Mastering the use of auxiliary verbs is essential for learners of the Croatian language, as they help create more complex sentences and convey precise messages.