6.5 The verb throw has the stem ἡ-. The rough breathing suggests that the stem was originally ση-, which, when REDUPLICATED, would produce the form σιση– (S 778). When these σ‘s drop out, and the initial ι aspirated, the result is as follows:
- ἡ– → ἱη–
The long stem vowel shortens in the plural forms in the same manner as τίθημι.
- ἱη– for the present tense singular forms
- ἱε– for the present tense plural forms and infinitive
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Note that ἵημι conjugates much like τίθημι does. The exception is the 3rd Person Plural, where a peculiar sound change resulted in the ε dropping, and a circumflex over the alpha. Why does this happen for ἵημι and not τίθημι? Great question.