a poem is a poem when you let out all your emotions about the subject you are writing about and become passionate about it. it's very different from prose. it doesn't have to rhyme, but you have to...
Poems is the plural of poem. The form poem's is a possessive form (genitive) or a contraction with the verb is. Plurals are NOT formed with an apostrophe.The apostrophe marks either a genitive form...