Alpha to Eta?

Barry Hickey bhickey at
Sun Aug 12 19:10:34 EDT 2001

 I'm attempting a self study of Koine Greek and have come upon a question.
Why does the final stem vowel alpha change to an eta in the Genitive
singular and Dative singular of a noun like GLWSSA?  What rule of grammar
necessitates the change?

Thank You,

Barry W. Hickey

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