In Russian - Correct!

The book introduces the main orthoepic, grammatical, and lexical norms of modern Russian language and offers a system of exercises that facilitate their assimilation. Special attention is paid to preventing errors typical for the Russian speech of bilinguals — students who speak two languages fluently, one of which is Russian, and live outside of Russia. The course is primarily intended for those who have learned Russian at home, in the family, but have not studied it systematically or are unsure of their proficiency. The book is aimed at high school students and first-year university students who wish to clarify or systematize their understanding of Russian grammar, word usage, and spelling.