Piano Sonata No. 15 in D Major Op. 28, Scherzo

The beginning section of this piece lasts until measure 33 where the repeat bars are. It has expository material and starts out in the key of D. I'm not really sure what to say about the structural units in this part of the piece. The piece goes from D in the first 8 measures to A in the next 8 then back to D, then finishing up with A at the end of the section. It seems like each phrase ends in a PAC and I dont feel any real antecedent-consequent behavior, so i'll call this a phrase group. Ok now we get to measures 33-49. This part is crazy developmental. It feels like we go from the key of A then to B I think? And ending the section in the key of A again. Then bam, after the fermata, we go right back to the same expository stuff that we saw in the beginning. Thus you have a rounded binary form.