Measures 7 - 8

Measures 7 and 8 are a variation of measures 3 and 4. The melody is transported an ascending minor 3rd. The harmony in the first 2 beats is exactly the same (a minor 3rd higher), but from then on Chopin moves chromatically the dominant 7th chords. Each 7th chord can be analyzed as the German 6th of the next chord:

The last chord will be used as a German Sixth chord. It will resolve into a Bb tonic in 2nd inversion.