Here's why:
* Short vowel sounds are typically quick and sharp. In "beg", the vowel "e" makes a short, sharp sound, similar to the "e" in "bed" or "pen".
* Long vowel sounds are usually drawn out and can sometimes be represented by a single vowel with a silent "e" at the end of the word (like in "bike" or "cone").
Let me know if you'd like to check the vowel sounds of other words!