This document outlines 8 plural rules in English: 1. Most words form the plural by adding 's', such as apple to apples. 2. Words ending in 'ch', 'sh', 's', 'ss', 'x' or 'z' add 'es', such as box to boxes. 3. Words ending in a consonant + 'y' change the 'y' to 'i' and add 'es', such as baby to babies. 4. Words ending in 'ay', 'ey', 'iy', 'oy', 'uy' add 's', such as donkey to donkeys. 5. Words ending in 'f' or 'fe