This article analyzes the question of the correct use of the phrases for the verb aptarnauti or the forms of this verb. The article discusses the semantic structure of these words and their disparate interpretation in the dictionaries of Lithuanian language. The data is collected from the Corpus of Modern Lithuanian Language, the sources of various functional styles, and the survey shows the real usage of the verb aptarnauti (and the noun aptarnavimas). The correctness of the usage of the examples is analyzed and special attention is given to some problematic cases that require more detailed analysis. This research indicates that some of the phrases, which users view as incorrect, comply with the language norm and specifically describe the characteristics that can help distinguish correct phrases from incorrect phrases.