Двоичните имена (Nomina mota) в славянските езици (с особен оглед към български език)

On the basis of a rich comparative material from the Slav languages the essential noun forming models in the category presented by gender couples, have been established: 1. The most widely spread is the model, where the masculine form is transformed as a basis, to whish is attached the feminine formant, for instance the cases with suffices: - in Bulgarian and Polish (приятел - приятелка; przyjaciel - przyjaciotka)', -ица/ -ница прщател>-прщател>ица, приятель приятельница in Serbian and Russian). Besides, a diversity of the cases may appear connected with the competition of the suffices, compare with Czeck (pfitelnice - pfitelkyne). Basic suffix for feminine formations in all Slav languages is -ka (with its extended suffices).