English poetry begins whenever we decide to say the modern English language begins, and it extends as far as we decide to say that the English language extends.
James FentonAt four lines, with the quatrain, we reach the basic stanza form familiar from a whole range of English poetic practice. This is the length of the ballad stanza, the verse of a hymn, and innumerable other kinds of verse.
James FentonGenerally speaking, rhyme is the marker for the end of a line. The first rhyme-word is like a challenge thrown down, which the poem itself has to respond to.
James Fenton