Thank you writeacher for your corrections! These are the very last sentences for you to check.
1) An epic contains formulas, that is, conventional expressions easy to remember, and kennings, which are metaphorical expressions.
Beowulf
2) Beowulf is a young Scandinavian hero who has to defend the kingdom of Heorot from two gigantic monsters, Grendel and Grendel’s mother.
3) The final events occur fifty years later when Beowulf is the old king of the Geats.
4) He succeeds in killing a winged fire-breathing serpentine dragon but is (in his turn) bitten and dies from the dragon’s poison.
5) Before dying, he gives Wiglaf, his faithful servant, both his voice and his armour. The gold he won in his battles is buried with him.
6) The snake slithered forward, wound itself and spat fire.
7) Beowulf raised his shield, drew his sword and finally raised (can you suggest a proper synonym) his hand.
8) The sword is described as a relict made for close battle
1. I'd delete all commas and replace "that is" with "including"
2. fine
3. fine
4. need to clarify this: "but is (in his turn) bitten..."
5. fine
6. I'd replace "wound" with "coiled"
7. "lifted" is about the same thing as "raised" -- one of the instances of "raised" in this sentence needs to be replaced.
8. Spelling ~~> relic (no "t")