Confusing Plurals

We'll begin with a box, and the plural is boxes,

But the plural of ox should be oxen, not oxes.

Then one fowl is a goose, but two are called geese,

Yet the plural of moose should never be meese.

You may find a lone mouse or a whole nest of mice,

But the plural of house is houses, not hice.

If the plural of man is always called men,

Why shouldn't the plural of pan be called pen?

If I speak of a foot and you show me your feet,

And I give you a book, would two be called beek?

If one is a tooth, and a whole set are teeth,

Why shouldn't the plural of booth be called beeth?

If the singular's this and the plural is these,

Should the plural of kiss ever be keese?

We speak of a brother, and also of brethren,

But though we say mother, we never say methren.

Then the masculine pronouns are he, his and him,

But imagine the feminine she, shis and shim.