No. 17,462 in Russian
тобою
"Тобою" means "by you" or "with you" (instrumental case of "ты").
In a sentence
Я горжусь тобою.
I am proud of you.
In this sentence, 'тобою' is used as an instrumental case form of 'ты' to express the means or instrument of pride.
Эта песня была исполнена тобою.
This song was performed by you.
Here, 'тобою' is in the instrumental case, denoting 'by you' in the context of passive voice or action performing subject.
Нам не сравниться тобою.
We can't compare to you.
In this example, 'тобою' again takes the instrumental case to convey the entity being compared.
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