Here's why:
* Spelling: The word "put" is spelled with a single "u". Words with long vowel sounds often have a double vowel (like "food") or a vowel followed by a silent "e" (like "bike").
* Sound: The "u" in "put" makes the short "u" sound, as in "cup" or "sun".
Let me know if you have any other words you'd like to check!