deriv SD cv (474) ashtadhyayi.com hei.de L 474 ETT STT a 7.3.88 ALPH OLDHOMEPAGE NEWHOMEPAGE
There is no /guNa of bhU भू sU सू before a hard /tiG.
As for instance, before /luG —
bhU भू + /luG /tip
→ bhU भू + /t'''
→ **abhU- अभूॱ + /t'''
(here we don't get the usual gbH before /tip)
→ !**abhUt अभूत् "he was"
bhU भू + /luG /sip → !**abhUs अभूस्
bhU भू + /luG /mip → !**abhUvam अभूवम्
In the /liT, the /guNa of bhU भू is debarred by indhibhavat..., as in **babhUva बभूव.
Why "hard"?
Before a soft we get gbS as usual —
bhU भू + /lRG
→ abhU अभू + /lRG by luGlaGlRGkSvaD...
→ abhU अभू + /sya + /lRG by syatAsIlRl...
→ abhU अभू + iSya इष्य + /lRG by ArdhadhAtuk... and /Satvam
→ abho अभो + iSya इष्य + /lRG by gbS
→ abhav अभव् + iSya इष्य + /lRG by ecoyavAyAvaH
→ abhU अभू + /sya + /lRG by syatAsIlRl...
→ !**abhaviSya- अभविष्यॱ
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