This is the second menuet in a pair. Note the three-bar basic idea and the overall design as a sentence. In section B, however, the first continuation is 8 bars, which seems quite unreasonable for a phrase, but I see no clear way to parse ideas within it. Perhaps Caplin's "continuation-like unit," used for looser form sections in later Viennese music, would be appropriate here. The second continuation, also, differs from the models in the earlier operas, in that it is a repeat of the first, not aa new phrase.
The first menuet in the pair also repeats the first continuation to form the second. Here an expansion of an underlying 4-bar phrase to six by means of sequences (see bars 19-21) is a plausible explanation and not unlike a design one might find in Haydn or even later composers. The overall design is antecedent-continuation and/or small binary.
The third menuet is simpler: an antecedent with two contrasting ideas is followed by a six-bar continuation that ends with a perfect authentic cadence. This design is a simple, balanced binary form (with repetition of each part).