ADD -S:  Many nouns can be pluralized simply by adding -s.
  EXAMPLES: nouns, verbs, birds, cans, books, shirts.

  ADD -ES: Nouns which end with sh, ch, x, and ss are pluralized by
           adding -es.
  EXAMPLES: churches, foxes, wishes, kisses, speeches, boxes.

  DROP Y, ADD -IES; Some nouns which end with y are pluralized by
	   dropping the y and adding -ies.
  EXAMPLES: flies, bunnies, stories, jellies, tries.
  NOT: plays, toys, keys.

  IRREGULAR: Some nouns don't follow rules.
  EXAMPLES: mouse-mice, goose-geese, tooth-teeth, foot-feet, man-men.