Here's why:
* Short vowel sounds are typically found in words with one syllable and a closed syllable structure (a vowel followed by a consonant).
* "Tent" fits this description: the vowel "e" is followed by the consonant "nt".
In contrast, long vowel sounds are often found in words with two syllables, or when a vowel is followed by a single consonant and a silent "e" at the end of the word.