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Be sure to always use a weak-strong pair, and count to five before you end a phrase. Blank verse is normal and we tend to use it all the time the way I'm doing here.
Iambic pentameter is a verse form, a rhythm of ten syllables where weak stresses alternate with strong ones, creating a sound like ta-DUM-ta-Dum-ta-DUM-ta-DUM-ta-DUM.Typical lines showing this rhythm...