Hawaiian alphabet not make it a letter of the alphabet. In publishing the Hawaiian Bible, they used the okina to distinguish ' ('my') from ' ('your'). It was not until 1864 that the okina became a recognized letter of the Hawaiian alphabet. As early as 1821, one of the missionaries, Hiram Bingham, was using macrons in making handwritten transcriptions of Hawaiian vowels. The macron, or "", was used to differentiate between short and long vowels. The current official Hawaiian alphabet consists of 12 letters: five vowels (A a, E e, I i, O o, U u) and seven consonants (H h, K
Phonological history of English vowels Phonological history of English vowels In the history of English phonology, there have been many diachronic sound changes affecting vowels, especially involving phonemic splits and mergers. The Great Vowel Shift was a series of chain shifts that affected historical long vowels but left short vowels largely alone. It is one of the primary causes of the idiosyncrasies in English spelling. The shortening of ante-penultimate syllables in Middle English created many long–short pairs. The result can be seen in such words as, <nowiki>*</nowiki>Earlier Modern English merged with . Tense–lax neutralization refers to a neutralization, in a particular phonological context in a