main theme, mm. 1–16; transition, mm. 16–19; subordinate theme, mm. 20–35
it remains throughout in the home key
the main theme is a tight-knit compound sentence; the transition is loose by virtue of its extreme brevity; the subordinate theme is also a relatively tight-knit compound sentence, but it is slightly looser than the main theme due to the minimal compression of its continuation (mm. 28–33)