What words have a long vowel sound that changes to short sound?

You're asking about words where a vowel has a long sound in one form but a short sound in another. This is a common phenomenon in English, often tied to the addition of a suffix or changes in pronunciation. Here are some examples:

1. Adding a suffix:

* "Hope" (long "o") becomes "Hoping" (short "o")

* "Hate" (long "a") becomes "Hating" (short "a")

* "Fine" (long "i") becomes "Finer" (short "i")

* "Pure" (long "u") becomes "Purity" (short "u")

* "Late" (long "a") becomes "Lately" (short "a")

2. Pluralization:

* "Mouse" (long "ou") becomes "Mice" (short "i")

* "Goose" (long "oo") becomes "Geese" (short "ee")

* "Tooth" (long "oo") becomes "Teeth" (short "ee")

3. Irregular Verbs:

* "Sing" (long "i") becomes "Sang" (short "a")

* "Ride" (long "i") becomes "Rode" (short "o")

* "Write" (long "i") becomes "Wrote" (short "o")

4. Other Examples:

* "Open" (long "o") vs. "Opened" (short "o")

* "Begin" (long "i") vs. "Beginning" (short "i")

* "Complete" (long "e") vs. "Completely" (short "e")

Why does this happen?

The reason for these vowel sound changes is often related to the position of the vowel within a word and the influence of surrounding letters. In some cases, the vowel sound becomes shorter when it is followed by certain consonant sounds or when a suffix is added.

Let me know if you'd like more examples or want to explore specific types of words with vowel sound changes!