Gotovye Zadaniia K Tetradi Po Russkomu Iazyku 8 Klass Bogdanova -
Phrases like по словам автора (according to the author) attribute information to others.
Words like кажется (it seems) or вероятно (probably) soften a statement.
Regarding your request for a , I have drafted a high-quality analysis of a central 8th-grade topic: The Role of Parenthetical Words in Russian Speech.
I can certainly help you with your Russian language studies and the preparation of a paper. Since "Bogdanova's Workbook" (Tetrad) focuses on complex syntax and punctuation in the 8th grade, I have organized some support for you below.
📝 Research Paper: The Role of Parenthetical Words (Vvodnye Slova)
Watch for "generalizing words" (obobshchayushchiye slova) which require a colon or a dash.