house → houses cat → cats book → books pen → pens play → plays

class → classes potato → potatoes box → boxes beach → beaches wish → wishes

story → stories enemy → enemies baby → babies family → families party → parties

wife → wives knife → knives thief → thieves life → lives leaf → leaves

man → men woman → women child → children foot → feet tooth → teeth mouse → mice goose → geese cactus → cacti person → people crisis → crises