We’ll begin with the box, the plural of which is boxes; but the plural of ox is oxen, not oxes.
One fowl is a goose, and two are called geese, but the plural of mouse is never meese.
You may find a lone mouse or a whole nest of mice; but the plural of house houses, not hice.
If the plural of man is men, why shouldn’t the plural of pan be pen?
If I speak of a foot and you show me two feet; or give you a boot, would a pair be called beet?
If one is a tooth and a whole set are teeth, why shouldn’t the plural of booth be beeth?
Then, the masculine pronouns are he, his, and him; but imagine the feminine as she shis, and shim!