If you are looking for a or a difficult rule (like N and NN in participles), let me know and I can explain the grammar rule behind it or help you solve it.
Sites like GDZ.ru often list supplemental materials for the 7th-grade Russian language curriculum, though they primarily focus on standard textbooks and workbooks by authors like Bystrova or Ladyzhenskaya. lingvisticheskii trenazher bogdanova 7 klass otvety
Finding official answer keys (GDZ) for this specific series can be difficult because they are often integrated into teacher-only manuals or updated frequently. However, you can find help through the following resources: If you are looking for a or a
Formation, suffixes, and punctuation in participial phrases. and punctuation in participial phrases.