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829. Root-aorist

a. This formation is in the later language limited to a few roots in आ ā and the root भू bhū, and is allowed to be made in the active only, the middle using instead the s-aorist (4), or theiṣ-aorist (5).

b. The roots in आ ā take उस् us as 3d pl. ending, and, as usual, lose their आ ā before it; भू bhū (as in the perfect: 793 a) retains its vowel unchanged throughout, inserting व् v after it before the endings अम् am and अन् an of 1st sing. and 3d pl. Thus:

s.d.p.s.d.p.
1अदाम्
ádām
अदाव
ádāva
अदाम
ádāma
अभूवम्
ábhūvam
अभूव
ábhūva
अभूम
ábhūma
2अदास्
ádās
अदातम्
ádātam
अदात
ádāta
अभूस्
ábhūs
अभूतम्
ábhūtam
अभूत
ábhūta
3अदात्
ádāt
अदाताम्
ádātām
अदुस्
ádus
अभूत्
ábhūt
अभूताम्
ábhūtam
अभूवन्
ábhūvan

For the classical Sanskrit, this is the whole story.