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sentence:

Here, the inflection of the noun meaning "quill pen" indicates its instrumental role: the nominative ???? changes its ending to become ?????.

Modern English expresses the instrumental meaning by use of adverbial phrases that begin with the words with, by, or using, followed by the noun indicating the instrument:

:I wrote the note with a pen.
:I wrote the note (by) using a pen.

Technical descriptions often use the phrase

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