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