To determine whether a vowel sound is short or long in a word containing "dge", you need to look at the vowel itself and the surrounding letters.
For example:
* "bridge": The vowel "i" is short because it is followed by a consonant cluster ("dge").
* "hedge": The vowel "e" is short because it is followed by a consonant cluster ("dge").
* "judge": The vowel "u" is short because it is followed by a consonant cluster ("dge").
Let me know if you have a specific word in mind, and I can help you determine the vowel sound.