Quantitative vowel changes

Shortening and Lengthening of Vowels: a long vowel before two consonants is shortened: OE – ce:pan (infinitive), ME ke:pen, but Past tense – kepte; but it remains long in other environments. But long vowels remain long before ‘the lengthening’ consonant groups: ld, nd, mb: we:nen, but we:nde (past simple). Long consonants also remain long before – st: lae:sta (least) – le:st. In the 13^th c. short vowels were lengthened in open syllables. Lengthening affected the short vowels a, e, o.: talu (tale) - ta:le, macian – ma:ken, etc. The narrow vowels i and u remained as a rule unaffected by this change, and thus the difference between short i and long and also between short u and long retained its quality as a phonemically relevant feature.

Changes of individual vowels:

Short and long ‘a’: OE short ‘a’ usually remained unchanged in ME. OE a/o before a nasal developed differently in different dialects. In West Midland ‘o’ was preserved: mon, con; in other dialects (Northern, East Midland and Southern) there is ‘a’ man, can. OE long ‘a’ also developed in different ways in different dialects. In Northern it remained unchanged, while in Midland and Southern it changed into long ‘o’: fa:- fo: (foe); ha:m – ho:m, etc.

Short ‘ae’ and long ‘ae’. OE short ‘ae’ in most dialects developed into short ‘a’: glaed – glad, aeppel – appel. But in the West Midland and Kentish it developed into ‘e’: gled, eppal. OE West Saxon long ‘ae’ changed into long open ‘e:’ slae:pan – sle:pen; in other dialects this ‘ae:’ had changed into closed ‘e:’. This closed ‘e:’ is preserved in ME.

Short Y and long Y: OE short ‘y’ developed differently in different dialects. In Northern and East Midland it changed into short ‘i’. In Kentish it became ‘e’ in the remaining dialects it was unchanged. Hence three dialectal variants: ‘first’, ferst’, ‘fyrst’. For example, the word ‘bury ‘ – here the pronunciation is Kentish, but the spelling is South-Western. OE long’y’ developed in the same way as the short ‘y’.

Conclusion: The ME sound system differs from the OE system: 1) OE dipthongs or ‘ea’ and ‘eo’ type disappeared 2) diphthongs of the ‘ei’ ‘ai’ type arose 3) vowel quantity became dependent on phonetic environment.

From the phonemic point of view the following points should me stated: 1) vowel quantity lost its phonemic significance, that is two vowel phonemes can no longer be distinguished by quantity: length versus shortness. Thus the number of vowel phonemes was reduced. 2) on the other hand, the appearance of new diphthongs [ai], [ei] [ au], [ou] marks the rise of four new vowel phonemes. In this way the reduction in the number of vowel phonemes due to changes in quantity is partly counteracted. 3) the number of consonant phonemes increased; the sounds [f, v] which had been allophones of one phoneme, became separate phonemes, no longer dependent on their environment, the same is true with [s,z].