[yorwba]

Flashcards can teach you grammar.

Explicitly, by writing explanations of various grammatical phenomena on flashcards. Implicitly, with usage examples that demonstrate how the grammar works.

Flashcards can teach you pronunciation.

Explicitly, by writing explanations of how to produce various sounds on flashcards. Implicitly, with recordings that demonstrate how things are pronounced. (Ok, paper flashcards can't do that, but we're not talking about those, right?)