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Allen and Greenough/ New Latin Grammar

IRREGULAR VERBS

204. 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 .

Note— The forms in brackets are not used in good prose.

INDICATIVESUBJUNCTIVE
PRESENTfīō, fīs, fitfīam, fīās, fīat
[fīmus], [fītis], fīuntfīāmus, fīātis, fīant
IMPERFECTfīēbam, fīēbās, etc.fierem, fierēs, etc.
FUTUREfīam, fīēs, etc.
PERFECTfactus sumfactus sim
PLUPERFECTfactus eramfactus essem
FUTURE PERFECTfactus erō
         IMPERATIVE
         [ , fīte , fītō , —]1
 INFINITIVE
PRESENT fierīPERFECT factus esseFUTURE factum īrī
 PARTICIPLES
PERFECT factus GERUNDIVE faciendus

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 .

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Notes
1
The imperative is rarely found, and then only in early writers.