edited by Meagan Ayer et al.

Irregular Verbs: compounds of sum

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197. Several verbs add some of the personal endings of the present system directly to the root,1 or combine two verbs in their inflection. These are called Irregular Verbs. They are sum, volō, ferō, edō, , , queō, fīō, and their compounds.

The conjugation of sum has already been presented in § 170.

198. Sum is compounded without any change of inflection with the prepositions ab, ad, , in, inter, ob, prae, prō (earlier form prōd), sub, super.

a. In the compound prōsum (help), prō retains its original d before e.

b. Sum is also compounded with the adjective potis, or pote (able), making the verb possum (be able, can). Possum is inflected as follows.2

Footnotes

1. These are athematic verbs, see § 174.2.
2. The forms potis sum, pote sum, etc. occur in early writers. Other early forms are potesse; possiem, -ēs, -et; poterint, potisit (for possit); potestur and possitur (used with a passive infinitive, cf. § 205.a).