This is the second movement of a three movement sonata. It begins in e minor. The first period is a parallel period, and it consists of two 8 measure phrases. The first phrase ends with a half cadence, and the second phrase ends with a strong perfect authentic cadence. Measure 33 marks the beginning of another 8 measure phrase ending in a half cadence. This repetition of the melody and the same cadence leads you to believe that there will be another parallel period, but that simply isn't the case. In measure 43 on a chord that is held out for the enitre measure, the key changes from e minor to a minor. In this phrase Beethoven also breaks the pattern of the even 8 measures per phrase that has occured thus far in the piece, and uses an 11 measure phrase, which I think is weird. This creates an asymmetrical contrasting period.
And that's what I think about that.
P.S. I heart Ladams.