Why do we add S to some words but ES to others? And when a word ends with Y, how do we know whether to change the Y to I before adding the plural suffix? And why on earth does knife become knives? You can unravel these mysteries with six simple rules.
HAIR – The fine threadlike strands growing from skin, especially on a person’s head. Your brother pulled my hair really hard, and now my head hurts! HEAD – The uppermost part of the human body, containing the brain, mouth and sense organs.