The bitter twist at the end of "the necklace" is that

A bitter twist was that years later she finds out that the necklace was just a replica or something like that and didn't cost as much as the actual necklace and was only worth 40 dollars(or what ever they called it in the story) 

- free verse.

- " in poetry, one of the best ways to practice technique is to write in. i want all to be unstressed so that “all the clocks” and “in the night” are matching anapests. many forms that sharpen skills are useful in free verse."