Why are the grammars of some old English poems so strange?

The grammar of old English poetry is strange because of other people's rules of the game, so don't use China's rules. Every language has its own specific grammatical rules, which can form a rigorous language and culture system. Usually read more grammar books and recite more. English poetry is difficult for beginners to understand and appreciate, but the study of English poetry is not endless. Knowing the grammatical features of poetry, we can find ways to understand and appreciate poetry more quickly and effectively.