Here's why:
* Short vowel sounds are typically found in words where the vowel is followed by one consonant. For example, "cat", "dog", "sun".
* Long vowel sounds are often found in words where the vowel is followed by a consonant and then a silent "e" at the end. For example, "bike", "hope", "kite".
In the word "fright", the "i" is followed by the consonant "ght", which creates a long vowel sound.