Final answer:
The grammatical structure that is repeated in the excerpt is the use of "Those that I," followed by a verb.
Step-by-step explanation:
The grammatical structure that is repeated in this excerpt is the use of "Those that I," followed by a verb. This structure is used multiple times to convey the speaker's perspective on the people they fight and guard. For example, in the line "Those that I fight I do not hate," the pronoun "I" is followed by the verb "fight" to express the speaker's detachment or lack of animosity towards their opponents.
Learn more about grammatical structure in poetry