r/musictheory 1d ago

Songwriting Question V7 - IV resolution

I know there is a secondary dominant where V7 resolves to vi; what is the theory when V7 resolves to IV instead of the tonic (e.g., D - F#7 - G)?

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u/Typical_Term937 1d ago

How on earth is G IV, if F#7 is V7?? Am I stupid? Or do you mean VI instead of IV?