I was finding a school for my toddler. I saw this new theory called long vowels and short vowels The teacher talk about apple, which she read something like "eiple" and the hat, which she claims use ...
There's a common pattern in English spelling where "short" vowels are pronounced as "long" vowels with the addition of a silent "e" at the end of the word. E.g. bit → bite mat → mate pet → pete ...