Breakdown of Она позвонила маме вечером.
мама
mom
она
she / it (for a feminine noun)
вечером
in the evening
позвонить
to call, to phone (perfective)
Questions & Answers about Она позвонила маме вечером.
Why is "mother" in the Dative case (маме) instead of the Accusative?
In English, we "call someone" as a direct action. In Russian, the verb позвонить means "to ring," so you are structurally ringing to someone. That is why the person you are calling always takes the Dative case.
Why does this sentence use the perfective verb позвонила rather than the imperfective звонила?
The perfective позвонила is used because this is a single, completed action with a clear result. She made the call, and the action was finished. If she had been repeatedly calling all evening, you would use the imperfective звонила.
Our current lesson is about expressing duration and completion times. Why doesn't вечером use those rules?
Those lesson rules apply when answering "how long?" (Bare Accusative) or "in how much time?" (за + Accusative). The word вечером simply answers "when?" (at what time of day).
So how exactly is вечером formed if it's not an Accusative time expression?
To say that something happened during a certain part of the day or season, Russian just puts the noun into the Instrumental case without any prepositions. So the noun вечер (evening) becomes вечером (in the evening).
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