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943. The noun is formed by the suffix

The noun is formed by the suffix तृ tṛ (or तर् tar); and this (as in its other than verbal uses: see 1182) is added to the root either directly or with a preceding auxiliary vowel इ i, the root itself being strengthened by guṇa, but the accent resting on the suffix: thus, दातृ dātṛ́ from √दा  give; कर्तृ kartṛ́ from √कृ kṛ make; भवितृ bhavitṛ́ from √भू bhū be.

a. As regards the presence or absence of the vowel i, the usage is said by the grammarians to be generally the same as in the s-future from the same root (above, 935). The most important exception is that the roots in  take no i: thus, kartṛ (against kariṣya); roots han and gam show the same difference; while vṛt, vṛdh, and syand have i here, though not in the s-future. The few forms which occur in the older language agree with these statements.