§204. Irregular Verbs

Faciō, facere, fēcī, factum, make, is regular. But it has imperative fac in the active, and, besides the regular forms, the future perfect faxō, perfect subjunctive faxim. The passive of faciō is—

• fīō, fiĕrī, factus sum, be made or become.

The present system of fīō is regular of the fourth conjugation, but the subjunctive imperfect is fierem, and the infinitive fierī.

a. Most compounds of faciō with prepositions weaken ă to ĭ in the present stem and to ĕ in the supine stem, and are inflected regularly like verbs in -iō:—

• cōnficiō, cōnficĕre, cōnfēcī, cōnfectum, finish.
• cōnficior, cōnficī, cōnfectus.

b. Other compounds retain a, and have -fīō in the passive: as, benefaciō, -facere, -fēcī, -factum; passive benefīō, -fierī, -factus, benefit. These retain the accent of the simple verb: as, bene-fă'cis (§ 12. a, Exc.).

c. A few isolated forms of fīo occur in other compounds:—

• cōnfit, it happens, cōnfīunt; cōnfīat; cōnfieret, cōnfierent; cōnfierī.
• dēfit, it lacks, dēfīunt; dēfīet; dēfīat; dēfierī.
• effierī, to be effected.
• īnfīō, begin (to speak), īnfit.
• interfīat, let him perish; interfierī, to perish.
• superfit, it remains over; superfīat, superfierī.