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Questions & Answers about Чья это ручка?
Why does the sentence use Чья instead of the standard dictionary word Чей?
The Russian word for "whose" acts like an adjective, so it changes to match the gender of the noun it asks about. Because ручка (pen) is a feminine noun (it ends in -a), we must use the feminine form чья. If we were asking about a masculine noun like дом (house), we would use the masculine чей.
Since ручка is feminine, why doesn't the word это change to the feminine эта?
In this common sentence pattern, это is used as an unchanging fixed word meaning "this is" or "it is". It's basically asking "Whose is this thing, the pen?". If you used эта, the phrase эта ручка would mean "this specific pen", which changes the focus slightly. Using the fixed это in the middle is the most standard way to ask who something belongs to.
In English we keep "Whose" and "pen" together. Why are чья and ручка separated by это?
Russian word order is very flexible, but the most natural and common way to ask "Whose [noun] is this?" is this exact pattern: put the question word first (чья), the fixed word это ("this is") second, and the noun you are asking about (ручка) last.
Where is the verb "is" in this sentence?
Russian skips the verb "to be" (am, is, are) in the present tense! The sentence literally reads "Whose this pen?", which is grammatically complete and perfectly natural in Russian.