No. 3,154 in Russian
матерью
"Матерью" means "by (or as) mother" in English, as the instrumental case of "мать" (mother).
In a sentence
Она была прекрасной матерью.
She was a wonderful mother.
In this sentence, 'матерью' means 'mother' in the instrumental case, following 'была' to indicate the role or quality of being a mother.
Ребёнок гордится своей матерью.
The child is proud of his mother.
Here, 'матерью' is in the instrumental case, showing the focus of the child's pride.
Он стал заботиться о больной матери.
He started caring for his sick mother.
Although 'матери' is used here, the switch to 'матерью' in related contexts highlights the instrumental role it plays, emphasizing the caring relationship.
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