Why have two different types of stanzas been used to structure ''brennan on the moor"?

The two different stanzas are the alternating stanzas of four lines and two lines, all with a consistent rhyme scheme. In the poem "Brennan on the Moor", each four-line stanza describes a new episode that continues the story, while the two-line stanzas repeat the same phrase about the main character, like a chorus.

1. this would be first person. it would be like "i walked home from school today" they are the narrator of the story and is a character as well.

2. first person because they used the word "i" in the quote.

3. i'm really not sure about this one i'm really sorry i never read it so i wouldn't know how to answer it. 

4. it would be character vs. society because everyone he meets there is always a conflict of some sort because he's stuck in his daydream.

5. it would be sadness at the loss of youth because the title itself tells us it's about age so it couldn't be about regret. and the tone just sounds sad, not angry. 

i hope this !

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explanation: