No. 4,375 in Russian
быстрым
"Быстрым" means "fast" or "quick" in English.
In a sentence
Он оказался быстрым бегуном.
He turned out to be a fast runner.
Here, "быстрым" is used as an adjective in the instrumental case, describing the noun "бегуном", indicating the quality (speed) of the runner.
С этим быстрым подходом результаты улучшаются.
With this quick approach, the results improve.
In this instance, "быстрым" is an adjective in the instrumental case modifying "подходом", describing the approach as quick.
У неё быстрым шагом получилось прийти вовремя.
With a quick step, she managed to arrive on time.
"Быстрым" is used adverbially within the instrumental case, describing the manner of walking (quickly, with a quick step).
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