Dear Жанна, thank you for this intensive review of Russian cases where the idea was to focus on singular and plural aspects of nouns in the different cases. I think it is a good course for the review of cases for A1 and A2 level students. There is definately scope for more of these type of micro courses on other Russian grammar topics. I would like to see an adjective and number course with regards to Russian cases. Thank you for the enthusiam, time and energy that you put into these courses.