deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE
Rules kartarizap ff work before hard doershowing, such as a hard tense, or /zatR.
pac पच् + doershowing /laT
→ **paca- पचॱ
So it will not work before an objectshowing hard, and those do not get /zap nor a replacement of /zap. But rule sArvadhAtuk... says that these should get /yak.
This /yak appears before an objectshowing /zAnac, and before /laT /laG /loT and hard liG.
pac पच् + objectshowing /laT
→ pac पच् + /yak + /laT by sArvadhAtuk...
→ !**pacya- पच्यॱ + /laT , as in **pacyate पच्यते
pac पच् + objectshowing /laG
→ apac अपच् + /laG by luGlaGlRGkSvaD...
→ apac अपच् + /yak + /laG by sArvadhAtuk...
→ !**apacya- अपच्यॱ + /laG , as in **apacyata अपच्यत
**apacya- अपच्यॱ + /laG /ta → !**apacyata अपच्यत "it was being cooked"
zru श्रु + objectshowing /loT /ta → **zrUyatAm श्रूयताम् "let it be heard"
There is no /yak before /liT and soft liG because these are soft.
Why there will be no /yak before /lRT /lRG /luT /luG?
Because these add /sya /tAs /tAs /cli after the root, instead of /yak.
So, /liT /lRT /lRG /luT /luG cannot be objectshowing?
They can. That is uncommon, however.
When they are objectshowing, they take bent endings. Which means that they only look different from the doershowing after /parasmaipadI roots. If you see a bent ending replacing these tenses, it is unlikely to be objectshowing.
kariSye vacanam tava करिष्ये वचनम्तव "I will do what you say"
kariSyate vacanam tava करिष्यते वचनम्तव
is likely to mean "he / she will do what you say"
is unlikely to mean "what you say will be done"