| Singular. | Plural. | |
| Ind. Pres. | fīō, fīs, fit | ——, ——, fīunt |
| Ind. Imp. | fīēbam, fīēbās, fīēbat | fīēbāmus, fīēbātis, fīēbant |
| Ind. Fut. | fīam, fīēs, fīet | fīēmus, fīētis, fīent |
| Subj. Pres. | fīam, fīās, fīat | fīāmus, fīātis, fīant |
| Subj. Imp. | fierem, fierēs, fieret | fierēmus, fierētis, fierent |
| Imper. | fī | fīte |
| Infin. Pres. | fierī | Part. Pres. —— |
[789.] In fīō, &c., ī represents an older ei, seen in FEIENT (inscr. 45 B.C.). The infinitive fierī for fierei owes its passive ending to analogy; the active form fiere occurs twice (Enn., Laev.). The vowel before -er- in fierem, &c., and fierī, is sometimes long in the dramatists, where a cretic (- ⏑ -) is required, but otherwise always short.
[790.] -fīō is used in apparent compounds ([394]): as, patē̆fit. In real compounds commonly -ficior: as, cōnficior; but sometimes -fīō: as, cōnfit, cōnfīunt, cōnfīat, cōnfieret, cōnfierent, cōnfī̆erī; dēfit, dēfīet, dēfīat, dēfierī; effit, effīant, ecfīerī; īnfit; interfīat, interfīerī; superfit, superfīat.
[791.] Some verbs in -iō, -ere (or -ior, -ī), have occasionally the form of verbs in -īre (or -īrī), in some parts of the present system, oftenest before an r, and particularly in the passive infinitive: as,
fodīrī, 3 times (Cato, Col. 2), circumfodīrī (Col.), ecfodīrī (Plaut.); adgredīrī (adgredīrier), 4 times (Plaut.), prōgredīrī (Plaut.); morīrī 6 times (Plaut. 4, Pomp., Ov.), ēmorīrī twice (Plaut., Ter.); orīrī, always; parīre, twice (Plaut., Enn.); usually potīrī (potīrier). Also cupīret (Lucr.); adgredīre, adgredībor, adgredīmur (Plaut.); morīmur (Enn.); orīris (Varr., Sen.), adorītur (Lucil., Lucr.), orīrētur (Cic., Nep., Sall., Liv.), adorīrētur (Liv., Suet.); parībis (Pomp.), PARIRET (inscr.); potīris (Manil.), potītur (Lucil., Ov.), &c., &c.
[II. Denominative Verbs.]
The First Conjugation.
laudō, praise.