Final answer:
The meter of the English folk song "Greensleeves" does not strictly conform to iambic pentameter, trochaic tetrameter, dactylic hexameter, or spondaic monometer. It likely follows a more flexible metric structure typical of folk ballads.
Step-by-step explanation:
The terms that describe the meter of the English folk song "Greensleeves" would most likely align with syllabic structures of folk ballads, typically not matching with rigidly structured poetic meters such as iambic pentameter (which consists of five iambs per line), trochaic tetrameter (which consists of four trochees per line), dactylic hexameter (which consists of six dactyls per line), or spondaic monometer (which consists of one spondee per line).
Given the nature of English folk ballads, it is more likely that the song "Greensleeves" follows a looser metric structure with a varied number of syllables per line, meant to be sung rather than strictly spoken. This flexibility allows for musical accompaniment and aligns with the storytelling tradition of ballads, which often use a less formal structure than that of classical epic poetry or Shakespearean sonnets.