Abstract. The article is devoted to the study of hidden grammatical rules and the concept of subconscious grammar, which determine the automation of linguistic behavior. It examines the main aspects related to the intuitive use of grammatical structures, including syntactic, morphological, phonetic and pragmatic rules. Special attention is paid to the processes occurring at the neuropsychological level and the role of practice in automating language. The article also explores modern areas of linguistic research, such as neurolinguistics, psycholinguistics and corpus linguistics, emphasizing their contribution to understanding the mechanics of linguistic perception and production.