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Questions & Answers about Пианино в комнате.
Where is the word for "is" in this sentence?
In Russian, the present tense of the verb "to be" is usually left out. So instead of saying "The piano is in the room", you simply say "Piano in room" (Пианино в комнате).
Why does the word for room end in -е here (комнате) instead of -а (комната)?
Because the sentence describes a location using the preposition в (in). This triggers the Prepositional case. For most feminine nouns ending in -а, like комната, the ending changes to -е to show location.
Does the word пианино change its ending if it is used in a different grammatical case?
No, it never changes! Пианино is a borrowed foreign word. In Russian, many foreign nouns that end in -о, -е, or -и (like пианино, кафе, or такси) are indeclinable. They keep the exact same form no matter their role in the sentence.
Since the current lesson teaches the У ... есть pattern for "having" something, could I say У комнаты есть пианино to mean the room has a piano?
It is grammatically possible but sounds very unnatural. The У ... есть construction is normally used when living things (like people or animals) own or possess something. To say a room has a piano in it, Russian speakers just state the piano's location, exactly like this sentence does.