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922. The precative active

The precative active is made by adding the active precative endings (above, 568) directly to the root. But:

a. Of final root-vowels (as before the passive-sign : 770), i and u are lengthened;  is usually changed to ri, but to īr and ūr in those roots which elsewhere show ir- and ur- forms (so-called -roots: 242), and to ar in  and smṛā is changed to e in the roots dā, dhā, sthā, pā drink sing, and a few others, in part optionally.

b. The root in general assumes its weakest form: a penultimate nasal is lost, as in badhyāsam from √bandh; the roots which are abbreviated in the weak persons of the perfect (794) have the same abbreviation here, as in ucyāsam, ijyāsam, vidhyāsam, supyāsam, gṛhyāsam; √çās forms çiṣyāsam (compare 639, 854 c): and so on.

c. It has been pointed out above (837) that the active precative is an optative of the root-aorist, with a problematic insertion of a sibilant between mode-sign and ending.