Meter: 10 10 10 10 (or any with 4 phrases between 8 and 10 syllables per phrase)
Form: ABAB
2nd phrase ends in a Plagal cadence!
Final phrase starts after a full count of silence (on beat 2) and features a melisma in the tenor voice supporting a perceived phrase augmentation leading to the final cadence.
Final cadence is a variation on Plagal with a V in the bass voice.