What we do with "o" and "u"

Of varied words with "o" and "u,"
The dictionary lists a slough,
And how to say them right is key;
They may not sound like what you see.

They're used to spell a word like rough;
A choice that might sound strange enough,
But then we see them used in bough,
And wonder what comes next, and how.

Are vowel changes ever through?
The answer's "no," for change they do.
These changes may seem curious,
But none of them are spurious.





































































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