Formation, suffixes, and punctuation in participial phrases.
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. lingvisticheskii trenazher bogdanova 7 klass otvety
The "Linguistic Simulator" (Лингвистический тренажер) for the 7th grade by is a popular workbook used in Russian schools to reinforce grammar, spelling, and punctuation skills.