Prepositions, conjunctions, and particles (specifically the distinction between ne and ni ).
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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
Spelling of "not" ( ne ) with gerunds and isolating gerund phrases. Adverbs: Comparative degrees and spelling of suffixes. lingvisticheskii trenazher bogdanova 7 klass otvety