The material of the first grade of elementary school is not only extremely difficult, but also crucial for mastering the Czech language. This publication will help you practice all the pitfalls and difficult grammatical phenomena of our mother tongue, such as inflections, gradations and patterns. It is suitable not only for primary school students, but also for future high school students, for whom it is a suitable aid in preparing for high school exams. Pupils and students can practice writing less well-known or even some foreign words correctly. The book includes a key to the exercises and clear tables for repeating the material.