कृञ् चानुप्रयुज्यते लिटि

Operational rule vidhi

The लिट्-लकार forms of verb roots कृ, भू, and अस् are applied after the आम्-प्रत्यय.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaIndeclinable च avyayaVerb अनुप्रयुज्यते tiṅantaRight context लिटि saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
Verb A finite verb form (tiṅanta).
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.

Full reading

च अनुप्रयुज्यते लिटि

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

After a verb which ends with आम् , the verb कृ 'to do', is annexed when लिट् (Perfect Tense) follows.
After the above verbs formed by taking the augment आम् the perfect tense of कृ is added to form their Perfect. This has already been illustrated in the above examples. The word कृ includes also the verbs भू and अस्. All these three may be used as auxiliaries. The verb अस् when used as an auxiliary, is not replaced by भू 3.4.52 before the लिट् affixes which are ardhadhatuka affixes. Thus पाचयाञ्चकार, पाचयाम्बभूव, पाचयामास.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.