I forgot to include the following statements. I really hope you can correct them, too.

1)"The fleetness of the serpent wound itself together ": the serpent quickly (?) coiled itslef up.
2)Beowulf summoned the strength to swing his sword so hard that it snapped against the dragon's head. "it bit less strongly than it sorely-straitened lord required of it then": 3) As it broke, it stroke the snake less strongly than required.
4) The snake grew savage in mood (became furious) and spat (ou) death-fire.
5)Thristing for revenge ("seething with warspite"), the dragon charged(him) a third time, seizing Beowulf by the neck with his poisonous fangs.
6) Beowulf died and his blood ran in streams.
7) Beowulf is a Scandinavian hero who is asked to fight (against?) two gigantic monsters in order to protect the kingdom of Haerot in Denmark.
8) The old Beowulf succeeds in killing a winged fire-breathing serpentine dragon. Unfortunately, he is stabbed to death by the dragon.
9) Before dying, he gives Wiglaf, his faithful servant, both his voice and his armour. The gold he won for his people is buried with him.
10) He embodies the courtly (?) ideal of the warrior: he is corageous, generous and strenuous. He is endowed with supernatural powers, too
11) Actually, he can spend days under water, kill winged and fire-breathing monsters, which live underwater as well as underground.
12)The epic poem recollects historical events as well as (or together with?)supernatural and mythological tales

1) "The fleetness of the serpent wound itself together": The serpent quickly coiled itself up.

2) Beowulf summoned the strength to swing his sword so hard that it snapped against the dragon's head. "it bit less strongly than it sorely-straitened lord required of it then": As it broke, it struck the snake less strongly than required.

3) The snake grew savage in mood and spat death-fire.

4) Thirsting for revenge ("seething with warspite"), the dragon charged, seizing Beowulf by the neck with its poisonous fangs.

5) Beowulf died and his blood ran in streams.

6) Beowulf is a Scandinavian hero who is asked to fight two gigantic monsters in order to protect the kingdom of Haerot in Denmark.

7) The old Beowulf succeeds in killing a winged fire-breathing serpentine dragon. Unfortunately, he is stabbed to death by the dragon.

8) Before dying, he gives Wiglaf, his faithful servant, both his voice and his armor. The gold he won for his people is buried with him.

9) He embodies the courtly ideal of the warrior: courageous, generous, and strenuous. He is endowed with supernatural powers, too.

10) Actually, he can spend days underwater, kill winged and fire-breathing monsters that live underwater as well as underground.

11) The epic poem recollects historical events as well as supernatural and mythological tales.