> pure vowels, with short /a i u/ and corresponding long vowels /aː iː uː/. There are also two diphthongs: /aj/ and /aw/.
The pronunciation of the vowels differs from speaker to speaker, in a way that tends to reflect the pronunciation of the corresponding colloquial variety. Nonetheless, there are some common trends. Most noticeable is the differing pronunciation of /a/ and /aː/, which tend towards fronted [æ(ː)], [a(ː)] or [ɛ(ː)] in most situations, but a back [ɑ(ː)] in the neighborhood of emphatic consonants. Some accents and dialects, such as those of the Hijaz, have central [ä(ː)] in …