Answer: In lines 16-20, the rhyme scheme abaab is used. The mood expressed through the words is that of wistfulness and reminiscence.
Sentimentality is also known to be manipulative. Oftentimes, sentimentalism obscures the facts of an actual event. Indeed, in this stanza, the narrator changes what he said earlier in the poem (that the two paths "had worn... really about the same") and states "I took the one less traveled by, / And that has made all the difference." This is a sentimental trick. He views his actions as having made all the difference, but he actually chose the path almost at random. These sounds ("I") add to this wistful, sentimental shift.
Question 1:
Humorous passage 1: "It (the umbrella) was made to be carried on the arm like an enormous ornamental bat and to allow one the opportunity to put on British airs as the atmospheric conditions demanded."
Humorous passage 2: "(The umbrella is) An item to be carried in the street, to be used to startle friends and—in the worst of cases—to fend off one’s creditors."
Question 2:
Passage 1 is funny because it compares the umbrella to an ornamental bat, which sounds weird in the first place. Plus, the umbrellas is said to be used by people who want to seem British, which is even more outrageously funny.
Passage 2 is funny because it treats the umbrella as a scary object which can be used even to fend off people you owe money to, which is absurd.
In both passages, the author uses tone and voice in a very witty way: he speaks seriously about absurdity, about unimaginable stuff. It is like an encyclopedia of weird and fun facts. That is what makes it funny: the contrast between a serious tone and larger than life images.
Zeus sends the two eagles down to attack the suitors as an omen of death/revenge.