Oromo phonology
This article describes the phonology of the Oromo language. Consonants. The Oromo language has 24 to 28 consonant phonemes depending on the dialect. The voiceless stops and are always aspirated. The velar fricative is mainly used in the eastern dialect (Harar) as a phoneme. It is represented as in the Oromo script ("Qubee") though it is pronounced as a in most other dialects. Vowels. Oromo has five vowels which all contrast long and short vowels. Sometimes there is a change in vowel quality when the vowel is short. Short vowels tend to be more centralized than their counterparts . Though sometimes diphthongs may occur, there are none that occur in a word's unaltered form. Tone. When needed, the conventions for marking tone in written Oromo are as follows: Tones on long vowels are marked on the first vowel symbol. In Oromo, the tone-bearing unit is the mora rather than the vowel of the syllable. A long vowel or a diphthong consists of two morae and can bear two tones. Each mora is defined as being of high or low tone. Only one high tone occurs per word and this must be on the final or penultimate mora . Particles do not have a high tone. (These include prepositions, clitic pronouns for subject and object, impersonal subject pronouns and focus markers.) There are therefore three possible "accentual patterns" in word roots. Phonetically there are three tones: high, low and falling. Rules: This use of tone may be characterized as pitch accent. It is similar to that in Somali. Stress is connected with tone. The high tone has strong stress; the falling tone has less stress and the low tone has no stress. Phonological processes. Epenthesis. When a vowel occurs in word-initial position, a glottal stop () is inserted before  it. Sandhi. Phonological changes occur at morpheme boundaries (sandhi) for specific grammatical morphemes. There may be assimilation.