Breakdown of Вода из ручья доходит до долины.
вода
water
из
out of
доходить
to reach (on foot)
до
as far as, up to
долина
valley
ручей
stream
Questions & Answers about Вода из ручья доходит до долины.
Why do we see "до" twice in доходит до долины?
This is a classic Russian pattern. The prefix до- on a verb of motion means "reaching a boundary or destination." It almost always pairs with the preposition до plus the Genitive case (here, долины). You can literally think of it as "goes as far as the valley."
Why use the imperfective verb доходит instead of the perfective дойдёт?
Because this sentence describes a general fact or a continuous state. The water constantly flows and reaches the valley. If you were talking about a specific, one-time event (like floodwater that will eventually reach the valley), you would use the perfective дойдёт.
What is the dictionary form of ручья, and why does it change like that?
The dictionary form is ручей (stream). When it takes the Genitive case after the preposition из, the -е- is a "fleeting vowel" that drops out. The final -й then changes to the Genitive masculine ending -я, resulting in ручья.
Why does the sentence use из ручья rather than от ручья for "from the stream"?
In Russian, из is used when something comes from the inside of a source, which is the opposite of в (into). Since the water originates from within the stream itself, из is the natural choice. От would imply moving away from the outside edge or general vicinity of the stream.
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