No. 7,985 in Russian
константином
The word "константином" is the instrumental case of the proper noun "Константин" (Konstantin), meaning "with/by Konstantin."
In a sentence
Я познакомился с Константином вчера.
I met Konstantin yesterday.
Here, 'Константином' is the instrumental case of the proper noun 'Константин,' used to indicate the means by or with which an action is performed—in this case, with Konstanin.
Мы обсуждали проект с Константином.
We discussed the project with Konstantin.
In this sentence, 'Константином' is used as the instrumental case to signify the companion or participant in the action of discussing.
Урок преподавал учитель по имени Константин.
The lesson was taught by a teacher named Konstantin.
Here 'Константином' is indirectly referenced as part of identifying an individual, though it's not explicitly in instrumental case since 'Константин' remains nominative in this standalone verbalized identification.
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