1)
Why does it say "Yevoshu" and "v'Yachperu"?
1.
Radak: The repetition is to strengthen the matter.
2)
Why does it say "Yachdav"?
1.
Radak: Just like they gathered to rejoice over me (my afflictions), so they will be ashamed together of their hopes.
3)
Who are "Smechei Ra'asi"?
1.
Malbim: They are those who said "Bila'anuhu" (verse 25).
4)
Why does it say "Yevoshu" and Yilbeshu Boshes u'Chlimah"?
1.
Radak: The matter is repeated to strengthen it.
5)
What are "ha'Magdilim Alai"?
1.
Radak: Their mouths [speak haughtily about me] - "va'Yarchivu Alai Pihem" (verse 21).