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Questions & Answers about Твоя забота о бабушке очень важна.
Why is it твоя, not твой or твоё?
Because забота is a feminine singular noun.
Russian possessive words like my / your / our change to match the noun they describe:
- твой = masculine
- твоя = feminine
- твоё = neuter
- твои = plural
Since забота is feminine, you say твоя забота.
What case is забота in, and why?
Забота is in the nominative case because it is the subject of the sentence.
The sentence means literally:
- Твоя забота о бабушке = Your care for your grandmother
- очень важна = is very important
So the thing being described as important is забота, and that is why it stays in the nominative.
Why is it о бабушке?