The harmonic analysis of the first phrase follows:
The first two measures probably don't need comments. Each voice follows the notes of the proposed analysis. However, measures 3 and 4 contain chromatic, non-harmonic notes in the upper and inner voices, as well as rhythmic counterpoint, which hide the harmonic plan.
The following image shows measures 3 and 4 in more detail. We transcribed the double flat in measure 3 as an A natural and added a B-flat in the final measure. This B-flat will appear in the next measure:
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