「#2942. ゲルマン語時代の音変化」 ([2017-05-17-1]) に引き続き，Hamer (15) より，標題の時代に関係する2つの音変化を紹介する．
|D||The diphthongs all developed as follows: ai > ā, au > ēa (ēa = ǣa), eu > ēo, iu > īo. (This development of eu and iu was in fact very much later, but it is placed here in the interests of simplification.)|
|E||a > æ unless it came before a nasal consonant.||dæg, glæd, but land/lond.|
The effects can be seen in comparing say OE dæg, OFr deg with Go dags, OIc dagr, OHG tag. (The original [æ] was later raised in Frisian.)
In outline, AFB turns low back */α/ to [æ], except before nasals (hence OE, OHG mann but dæg vs. tag. It is usually accepted that at some point before AFB (which probably dates from around the early fifth century), */α/ > [α̃] before nasals, and the nasalized vowel blocked AFB.
・ Hamer, R. F. S. Old English Sound Changes for Beginners. Oxford: Blackwell, 1967.
・ Lass, Roger. Old English: A Historical Linguistic Companion. Cambridge: CUP, 1994.
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