1, the number of lines is different: pentameter iambic pentameter is pentameter, each line has ten syllables, divided into five steps, each step has two syllables, and the stress falls on the second syllable. This rhythm is usually used to write English classical poems, such as Chaucer's poems.
2. Different rhymes: Heroic couplets are a kind of English classical poetic style, which evolved from ten syllables and two rhymes. There are five steps in each line, and each step has two syllables, the first is light tone, and the second is stress. Sentence patterns are balanced, neat, accurate, concise and elegant. This rhythm is usually used to write English epics, such as Beowulf and Lady Campbell.