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Questions & Answers about Позвоните мне завтра.
Why is the verb perfective (позвоните) instead of imperfective (звоните)?
You use the perfective aspect here because you are asking for a single, specific action to be completed: one phone call tomorrow. If you used the imperfective звоните, it would sound like a general habit, such as 'call me regularly', which doesn't fit with a specific, one-time request for tomorrow.
In English we say 'call me', so why is it мне (Dative) instead of меня (Accusative)?
The Russian verb звонить / позвонить works more like the English phrase 'to make a call' or 'to ring'. You are making a call to someone. That direction requires the Dative case, which changes я (I) into мне (to me).
Why does позвоните end in -ите?
The -ите ending shows this is a command (the imperative) directed at вы (formal 'you' or plural 'you'). If you were talking to a close friend or family member (ты), you would drop the -те and just say позвони.
Does the word завтра need a preposition or a special case to act as a time expression?
No, завтра is an adverb, meaning its form never changes. Unlike nouns that need the Accusative case to show duration or time to completion (which you are practicing in this lesson), simple time adverbs like завтра (tomorrow), сегодня (today), and вчера (yesterday) stand completely on their own.