Is sunshine a long or short vowel?

"Sunshine" doesn't have a long or short vowel sound. It has a diphthong, which is a combination of two vowel sounds.

Here's why:

* Sun: The "u" sound in "sun" is a short vowel sound.

* Shine: The "i" sound in "shine" is a long vowel sound.

When you combine these two sounds, you get a glide from the short "u" sound to the long "i" sound, creating the diphthong "ai".