42.11 The PERFECT MIDDLE is formed simply by adding the PRIMARY MIDDLE ENDINGS directly to the perfect tense stem. In other words, ALL perfect middle verbs are athematic, no matter a verb's first principal part. (Recall that all verbs in the future tense are thematic, no matter the first principal part!).
Later we discuss what happens when these middle endings are added to consonant stem verbs. For now, note how regular the PERFECT MIDDLE formation is with perfect tense stems that end in a vowel.
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