Please note that the templates above almost never fit an actual poem exactly. If we use this foot-based method to describe poetic meter in English, we have to allow for abundant "substitution," where any iamb ( * / ) can become a trochee ( / * ), a spondee ( / / ), or a pyrrhic ( * * ). Trochaic rhythm tends to be somewhat more regular, but substitutions occur there as well. Sometimes poets introduce three-syllable feet into a line of iambs or trochees, and three-syllable (or "triple") footed meters often shift from anapests ( * * /), to dactyls ( / * * ), amphibrachs ( * / * ), amphimacers ( / * / ), and other combinations.
Note that spondaic meters or pyrrhic meters (as opposed to individual feet) in English are impossible because of the constant alternation of stressed and unsrtessed syllables. Despite this obvious truth, some discussions of English metrics speak of spondaic meter and even attempt to illustrate it with lines isolated from poems written in iambic or anapestic meters.