Our assignment last week in my poetry class was to write a sonnet–English or Italian, our choice. But when it comes to sonnets, that, in many ways, is where the freedom seems to end. You can’t write as many lines as you want (has to be 14, of course). You can’t make it rhyme–or not–however you might like (must be abab, cdcd, efef, gg for the English kind). Line length is non-negotiable, too:five “feet” of “iambs” (unstressed syllables followed by stressed ones). Sonnets and the poets who write them take their metrics very, very seriously.