→-s
→-es
-y→-ies
-y→-ys
-f/-fe→-ves
-a/o/ous→-e/e/ic
old english
-o→-os/-oes
-o→-s/-es
unchanged
plural forms
foreign plurals
-us→-a
-us→-i
-um→-a
-ex→-ices
-is→-es
-on→-a
Italian
Hebrew
Greek
→-s
singular
plural
boy
boys
bed
beds
book
books
pencil
pencils
day
days