Example A certain book = some book
Your certain book = some of your book = some book of yours your some book ?
3 certain men = some 3 men
"Some " = indefinite adj. not "indefinite quantitative adj." Thanks
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slide green 584Example A certain book = some book
No, those expressions do not mean the same thing.
slide green 584Your certain book = some of your book = some book of yours your some book ?
None of those expressions are grammatical.
slide green 5843 certain men = some 3 men