Why English Is So Hard

On the eve of my first semester of language school, I have been reminded of why English is so hard and Spanish is supposedly so easy but the following poem:

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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 goose, but two are called geese;
Yet the plural of moose should never be meese.

You may find a lone mouse or a whole lot 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?

The cow in the plural may be cows or kine,
But the plural of vow is vows, not vine.
And I speak of a foot, and you show me your feet,
But I give you a boot - would a pair be called beet?

If one is tooth and a whole set are teeth,
Why shouldn't the plural of booth be called beeth?
If the singular is this, and the plural is these,
Should the plural of kiss be nicknamed kese?

Then one may be that, and three may be those,
Yet the plural of hat would never be hose;
We speak of a brother, and also of brethren,
But though we say mother, we never say methren.

The masculine pronouns are he, his, and him,
But imagine the feminine she, shis, and shim!
So our English, I think you will all agree,
Is the trickiest language you ever did see.

-taken from "Learning a Foreign Language" by Eugene Nida
My first assignment here at language school...read the whole book.