Answer:
Ballad: Ballads are often 13 lines with an ABABBCBC form, consisting of couplets (two lines) of rhymed verse, each of 14 syllables. Another common form is ABAB or ABCB repeated, in alternating 8 and 6 syllable lines.
Sonnet: a poem of fourteen lines using any of a number of formal rhyme schemes, in English typically having ten syllables per line
Ode: It is an elaborately structured poem praising or glorifying an event or individual, describing nature intellectually as well as emotionally. A classic ode is structured in three major parts: the strophe, the antistrophe, and the epode. Different forms such as the homostrophic ode and the irregular ode also enter.
Elegy: sometimes used as a catch-all to denominate texts of a somber or pessimistic tone, sometimes as a marker for textual monumentalizing, and sometimes strictly as a sign of a lament for the dead"
Step-by-step explanation:
I know that this doesn't specifically answer the question(s) that you wanted to be answered, but from this information you can definitely interpret which one is which. I hope this helps.