Word
Мой брат должен выносить мусор каждый день.
Meaning
My brother has to take out the trash every day.
Part of speech
sentence
Pronunciation
Course
Questions & Answers about Мой брат должен выносить мусор каждый день.
Why do we use должен here instead of должна or должно?
Должен means "must" or "has to", but it behaves like a short adjective and has to agree with the subject. Since the subject is мой брат (a masculine noun), we use the masculine form должен. If the subject were "my sister", it would be моя сестра должна.
Why is the verb выносить in the imperfective aspect rather than the perfective вынести?
The phrase каждый день (every day) tells us this is a regular, repeated habit. In Russian, repeated or routine actions always require the imperfective aspect, even when following a word of obligation like должен.
What case is the word мусор (trash) in, and why didn't its ending change?
It is in the accusative case because it is the direct object receiving the action of the verb (it is the thing being taken out). However, because мусор is a masculine inanimate noun (not a living person or animal), its accusative form looks exactly like its dictionary form.
Why don't we use a preposition like в or на before каждый день (every day)?
To say "every" followed by a time period in Russian, you don't need a preposition. You simply put the phrase directly into the accusative case. Because каждый день is masculine and inanimate, its accusative form is identical to the nominative.