Here's why:
* Short vowels are typically found in words where the vowel sound is quick and short, often followed by a consonant. Examples include "cat," "dog," "run," and "hop."
* "Sly" has a long "i" sound, which is characteristic of a long vowel. The "y" at the end of the word acts as a vowel sound, creating a longer vowel sound.
Therefore, "sly" is a long vowel word, not a short vowel word.