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565. Optative mode-sign

a. The optative mode-sign is in the active voice a different one, according as it is added to a tense-stem ending in a, or to one ending in some other final. In the latter case, it is yā́, accented; this  is appended to the weaker form of the tense-stem, and takes the regular series of secondary endings, with, in 3d plur., us instead of an, and loss of the ā before it. After an a-stem, it is ī, unaccented; this ī blends with the final a to e (which then is accented or not according to the accent of the a); and the eis maintained unchanged before a vowel-ending (am, us), by means of an interposed euphonic y.

b. In the middle voice, the mode-sign is ī throughout, and takes the secondary endings, with a in 1st sing., and ran in 3d pl. After an a-stem, the rules as to its combination to e, the accent of the latter, and its retention before a vowel-ending with interposition of a y, are the same as in the active. After any other final, the weaker form of stem is taken, and the accent is on the ending (except in one class of verbs, where it falls upon the tense-stem: see 645); and the ī (as when combined to e) takes an inserted ybefore the vowel-endings (a, āthām, ātām).

c. It is, of course, impossible to tell from the form whether i or ī is combined with the final of an a-stem to e; but no good reason appears to exist for assuming i, rather than the ī which shows itself in the other class of stems in the middle voice.