27, first 20 measures (introductory phrase).
No.

3, first 29 measures, to double-bar (introductory phrase).
No.

36, first 27 measures (the similarity between phrase one and phrase three proves the double-period form; the extra phrases are extension by "addition," as in the group form).
No.

6, measures 8-17.
Mozart, pianoforte sonata.

No.