: When a mistake is found, refer back to the specific grammar section in the Valynets textbook to understand why the answer is different.
: The official adu.by portal offers the textbook's theoretical material and can be a source for checking the correct rules applied in exercises. Core Topics Covered in the 3rd Grade Manual
: The publisher Aversev provides digital versions of textbooks and sometimes supplementary workbooks (worksheets) that include keys for teachers and parents.