The men of Herot are celebrating while Grendel lies in agony below, impatient. "A monster, living down in the darkness, growled in pain, impatient as day after day the music rang loud in that hall." (Lines 1-4_
The conflict is between the good of the Danes and between Grendel's desire for evil. "No savage assault could quench his lust for evil" (lines 52-53)
"The Protagonists are Beowulf and the Danes, while the Antagonists are Grendel and his Mom. I don't know what we are supposed to use as evidence for this.
Beowulf fight with Grendel is an example of rising action. "Then he stepped to another still body, clutched at beowulf with his claws." (lines 304-305)
The theme is that good triumphs over evil. "He never dared to touch king Hrothgar's glorious throne, protected by god." (Lines 83-4)
The climax is Beowulf fight with Grendel's mother underwater. "In an instant she had him down, held helpless" (line 473)