Analysis of the C Major Invention (BWV 772) by Bach

Measures 7 and 8

The exposition of measures 1 and 2 is repeated in measures 7 and 8 with the following changes:

1. Bach uses invertible counterpoint at the octave (what was played by the upper voice is now played by the lower voice and viceversa).
2. The passage is now in the dominant key (G Major).

Compare with measures 1 and 2: