Употребление глаголов совершенного вида в болгарских и русских отрицательных побудительных предложениях

The article discusses the possibilities in Bulgarian and Russian to express command with a perfective verb in the negative. Although the phenomenon is peripheral in the grammatical systems of both languages, the examples adduced show possibilities to express various meanings and nuances (ban, warning, request, fear, ability/inability, permissibility / impermissibility, etc.).