Here's why:
* Short vowel sound: The "u" in "sun" has a short vowel sound, similar to the "u" in "cup" or "but."
* Long vowel sound: Long vowel sounds are typically represented by a single vowel letter followed by a silent "e" at the end of a word (like "cone" or "bike"), or by a vowel digraph (like "rain" or "boat").
Let me know if you have any other words you'd like to explore!