The first half of the fourth-grade curriculum typically focuses on building strong grammatical foundations:

ВПР по русскому языку в 4 классе: как подготовиться к успешной сдаче

You can access full answers for Part 1 of the most common textbooks at these sites:

Learning about simple and compound sentences, subjects, and predicates.

Deep dives into prefixes, roots, suffixes, and endings.

Complete exercise walk-throughs can be found on the Skysmart platform .