Of the five kinds of feet illustrated here, the iambus is by far the most often used in English verse; the spondee is the rarest.
For example, an iamb / iambus or iambic foot is represented by an unaccented syllable followed by an accented one.
They consist of a collection of seventeen poems in different versions of the iambus , the metre traditionally associated with lampoon.
The aural effect, then, is that the second and last feet are always heard as true iambuses , while the first and/or third may be spondees.
The metre throughout is iambic tetrameter, alternating with trimeter - in other words, lines of four iambuses alternate with lines of three.