The subject of study of this thesis is the formation of copulative compounds in language manuals and how the manuals categorize them and what they consider a copulative compound as well as how copulative compounds are used in journalist register. Also, it is determined which copulative compounds are most often used in journalist register and in which context. As the authors of modern language manuals pay more and more attention to them, we see more and more disagreements and ambiguities related to the fact of what should be considered a copulative compound. The thesis also determines the types language registers and how they are categorized in various manuals and describes what exactly journalist register is. The aim of this thesis is, in addition to the problems of determining what a copulative compound is, to show how often and which copulative compounds are used in journalist register and to show how, due to the aforementioned problems of determination, writing errors also occur in these same texts.