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| Old English |
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| History and description of |
| English pronunciation |
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| Historical stages |
| General development |
| Development of vowels |
| Development of consonants |
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Old English phonology is necessarily somewhat speculative since Old English is preserved only as a written language. Nevertheless, there is a very large corpus of the language, and its orthography apparently indicates phonological alternations quite faithfully and so certain conclusions can easily be drawn.
Old English had a distinction between short and long (doubled) consonants, at least between vowels (as seen in sunne "sun" and sunu "son", stellan "to put" and stelan "to steal"), and a distinction between short vowels and long vowels in stressed syllables. It had a larger number of vowel qualities in stressed syllables (/i y u e o æ ɑ/ and in some dialects /ø/) than in unstressed ones (/ɑ e u/). It had diphthongs that no longer exist in Modern English (/io̯ eo̯ æɑ̯/), with both short and long versions.