Here's why:
* The vowel sound in "share" is a short "a" sound. This sound is similar to the "a" in "cat" or "hat."
* Long vowel sounds are typically indicated by a vowel followed by a silent "e" at the end of a word. For example, "hate" has a long "a" sound.
* The "e" in "share" is pronounced. It creates the "air" sound at the end of the word.
Therefore, "share" contains a short vowel sound, not a long one.