Here's why:
* Long vowel sounds are typically represented by the vowel letter followed by a silent 'e' (like "pine" in "pine tree").
* In the word "pine", the 'e' is not silent. It is pronounced, creating a diphthong sound, which is a combination of two vowel sounds.
* The vowel sound in "pine" is a short 'i' sound.
Therefore, "pine" does not have a long vowel sound.