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.

Exceptional Features

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).

Compound Rules

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

Our Latin Kin

Not all relations between Latin and English counterparts may be described as derivation. There are a few genuine parallels that stem from a more distant common relation (proto-Indo-European). With these words, Latin is less a mother or grandmother, and more of a cousin.

As we can imagine, this kind of relationship features more striking variations in phonetic form than direct derivation. As Latin and (what A&G call) Primitive Germanic began to undergo separate consonantal and vowel shifts, their PIE derivations took on similar yet distinct forms, which eventually conformed to distinct phonological rules in each family of languages.

(*ph₂tḗr) —> pater / father

(*bʰer) —> ferō / bear, frater / brother

(*dwṓu) —> duo / two, (dēns) dentis / tooth

(*h₁rew) —> ruber / red

(*h₂wḗh) —> ventus / wind

(*sneygʷʰ) —> nive / snow

(*ǵʰans) —> ānser / goose

For those interested, you’ll find a larger list in A&G (19). There are some general phonological rules we see emerging: the aspirated b of PIE becomes Lain f/b and English f/b/v, the aspirated d of PIE becomes Latin f/b/d but in English only d, etc.

The Essential AG: 18, 19