Final measures

Measures 13 and 14 are in the A Minor key, the subject is presented in its original form (1) and transformed by inversion (2)

A series of imitations present the subject transformed by inversion (measures 15 and 17) and in its original form (measures 16 and 18). These measures takes us to the F Major key:

The same progression used in measures 3 and 11 reappears. This time the subject is in its original form (1) while the augmented motive is inverted (2) and brings us back to C major:

This table compares the harmonic progressions used in measures 3, 11 and 19:

	Soprano	Bass	Modulation
3 to 4	Inverted subject	Augmented subject	C major to G major (modulation by ascending fifth)
11 to 12	Augmented subject	Inverted subject	D minor to A minor (modulation by ascending fifth)
19 to 20	Subject	Augmented and inverted subject	F major to C major (modulation by ascending fifth)

Listen to the final measures: