Words of service parts of speech, which include prepositions, despite significant quantitative limitations compared to the innumeracy of significant words, play a role of paramount importance in the organization of speech. Two processes take place simultaneously in the statement: the process of highlighting some elements of reality and expressing them using the words of a given language and the process of establishing relationships between these language signs of the highlighted elements of reality, as a result of which a certain organic whole is created - a sentence.