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Questions & Answers about Кровотечение остановилось.
Why is кровотечение the subject here, and what case is it in?
Кровотечение is in the nominative singular, because it is the subject of the sentence: it is the thing that stopped.
A good literal way to think about the structure is:
[The bleeding] stopped.
So Russian treats кровотечение as the subject, just as English treats the bleeding as the subject.
Why does the verb have the form остановилось?
Because Russian past-tense verbs agree with the subject in gender and number.
Кровотечение is a neuter singular noun, so the past tense uses -ло:
- masculine: остановился
- feminine: остановилась
- neuter: остановилось
- plural: остановились
So:
- кровотечение остановилось
- рана затянулась
- поезд остановился
The ending matches the noun.
How can I tell that кровотечение is neuter?
A major clue is the ending -ие. Nouns ending in -ие are typically neuter in Russian.
So:
- здание — neuter
- состояние — neuter
- кровотечение — neuter
That is why the verb is остановилось, not остановился or остановилась.