Class 9 is known as क्रयादि in the Ashtadhyayi. The exemplar verb root is 'krI:to buy'.
In Strong forms, affix 'nA' to form the verbal base. In Weak forms, if the termination starts with a consonant, affix 'nI', otherwise affix 'n' to form the verbal base. Drop pre-existing nasal if present (for e.g., see 'stambh' below).
Examples of the derivation of the Third Person-Singular, Dual, and Plural Present Verb conjugations are shown in the following table:
Verb Root | Step 1: affix 'nA' (Strong)/ 'nI' (Weak+consonant)/ 'n' (Weak+vowel) | Verbal Base (Strong/ Weak+consonant/ Weak+vowel) | III-Singular Present | III-Dual Present | III-Plural Present |
krI (to buy:Par.) | krINNA/ krINNI/ krINN | krINNA/ krINNI/ krINN | krINNAti | krINNItas | krINNanti |
stambh (to obstruct:Par.) | stabhnA/ stabhnI/ stabhn | stabhnA/ stabhnI/ stabhn | stabhnAti | stabhnItas | stabhnanti |
Derivation: