The author analyzes the point of view of Vodjidali Mudjmali, the author of the well-known work “Matlat-ul-Ulum va Madjma-ul-Funun” dwelling on the ways of the right usage in regard to lexical units and grammatical constructions. In the tenth chapter of his hook Vodjidali Mudjmali registers numerous cases of violation of grammatical norms and proper combinability of words, he offers 11 factors which might promote smoothness and expressiveness of speech.