Learn Polish: Proszę nauczyć mnie polskiej wymowy. - Please teach me Polish pronunciation.

The verbs uczyć and nauczyć have a specific rule: the person being taught takes the Accusative case (here, mnie), but the subject being taught requires the Genitive case. You can think of it historically as teaching someone "of" a subject.

Why use mnie instead of the Dative pronoun mi?

English speakers often want to translate "teach to me" and reach for the Dative pronoun mi. However, because nauczyć requires the Accusative case for the person being taught, you must use the Accusative pronoun mnie.

Why does this request use the perfective verb nauczyć instead of the imperfective uczyć?

Using the perfective nauczyć emphasizes the successful result of the action. The speaker is not just asking someone to spend time tutoring them (uczyć), but asking to be taught until they have actually mastered the skill of Polish pronunciation.

Is Proszę nauczyć... more polite than saying Naucz mnie...?

Yes, using proszę followed by an infinitive is a very common, standard way to make a polite request in Polish. It sounds much softer and more respectful than using the direct imperative command Naucz mnie (Teach me).