The essential verb faciō, facere, fēcī, factum, is generally regular, though features a few variant forms you may not have known, and a distinct set of rules for compounds which you may have always ‘sensed’ but never understood.
The two exceptional features of faciō are its imperative singular (just the fac, ma’am—not face, which sounds like a Canadian swearing), and its passive forms, derived from fīō (to be discussed in a later post).
Faciō also features a variant future perfect faxō (in place of the more common fēcerō) and a variant perfect subjunctive faxim (in place of the more common fēcerim).
Compounds of faciō (i) replace a with i and (ii) replace the supine -actum with –ectum, and while retaining the -iō declension, sometimes they feature passive forms that are not derived from fīō.
- cōnficiō, cōnficere, cōnfēcī, cōnfectum (finish)
- cōnficior, cōnficī, cōnfectus sum (die) [but note that ‘ficior’ is not a word!]
- afficiō, afficere, affēcī, affectum (affect)
- afficior, afficī, affectus sum (be affected
- inficiō, inficere, infēcī, infectum (dye, poison)
- inficior, inficī, infectus sum (be poisoned)
Relation to PIE
For those interested in the topic discussed in the last post, the Latin faciō is derived from the PIE dʰeh₁, which also produced τίθημι, do, and (the German) tun.
The Essential AG: 204, 204a