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A centering diphthong is one that begins with a more peripheral vowel and ends with a more central one, such as [ɪə̯], [ɛə̯], and [ʊə̯] in Received Pronunciation or [iə̯] and [uə̯] in Irish. Many centering diphthongs are also opening diphthongs ([iə̯], [uə̯]). Diphthongs may contrast in how far they open or close.
In the transition to Middle English, the system underwent major changes by eliminating the diphthongs and leaving only one pair of low vowels but with a vowel distinction appearing in the long mid vowels: The diphthongs /æɑ̯/ /æːɑ̯/ simplified to /æ/ and /æː/, respectively. Subsequently, the low vowels were modified as follows:
A simplified diagram of Canadian raising (Rogers 2000:124).Actual starting points vary. Canadian raising (also sometimes known as English diphthong raising [1]) is an allophonic rule of phonology in many varieties of North American English that changes the pronunciation of diphthongs with open-vowel starting points.
If diphthongs are counted separately, they are /iu, ou, oi, eu, ei, au, ai, ao, ae, oːu, eːi, aːu, aːi, aːo, aːe/. There is some allophonic variation of the vowels, but it is much less dramatic than that of the consonants. Hawaiian syllable structure is (C)V(V) where C is any consonant and V is any vowel, which can be long or short.
This arose because the two words were originally pronounced differently: pain used to be pronounced as /peɪn/, with a diphthong, and pane as /peːn/, but the diphthong /eɪ/ merged with the long vowel /eː/ in pane, making pain and pane homophones (pane–pain merger). Later /eː/ became a diphthong /eɪ/. break and brake: (She's breaking the ...
The status of diphthongs in Persian is disputed. [6] [7] Some authors list /ei, ou, ɒi, oi, ui/, [6] others list only /ej/ and /ou/, but some do not recognize diphthongs in Persian at all. [6] [7] A major factor that complicates the matter is the change of two classical and pre-classical Persian diphthongs: /ai/ > /ei/ and /au/ > /ou/.
The falling diphthong /ɪw/ of due and dew changed to a rising diphthong, which became the sequence [juː]. The change did not occur in all dialects, however; see Yod-dropping. The diphthongs /əɪ/ and /əʊ/ of tide and house widened to /aɪ/ and /aʊ/, respectively. The diphthong /ʊɪ/ merged into /əɪ/ ~ /aɪ/.
ui sometimes represented the diphthong /ui̯/, as in cui listen ⓘ and huic. [27] The diphthong ei mostly had changed to ī by the classical epoch; ei remained only in a few words such as the interjection hei. If there is a tréma above the second vowel, both vowels are pronounced separately: aë [ä.ɛ], aü [a.ʊ], eü [e.ʊ] and oë [ɔ.ɛ].