[687]. quis, quem, quid, and quibus come from the stem qui-; the other parts come from quo-, quā-. quae stands for an older quai ([690]). For quid and quod, see [659].
[688]. Old forms of the genitive singular are quoius, and of the dative quoiei, quoiī, or quoi, also in derivatives of quī or quis. A genitive plural quōiūm is old and rare. The dative and ablative plural is sometimes quīs from quo-, quā-. A nominative plural interrogative and indefinite quēs is rare (Pacuv.).
[689]. The ablative or locative is sometimes quī, from the stem qui-: as an interrogative, how? as a relative, wherewith, whereby, masculine, feminine, or neuter, in old Latin sometimes with a plural antecedent; especially referring to an indefinite person, and with cum attached, quīcum; and as an indefinite, somehow.
[690]. Other case forms of quī or quis and their derivatives are found in inscriptions, as follows:
N. QVEI, prevalent in republican inscriptions; also QVI; once QVE. G. QVOIVS, regularly in republican inscriptions; cviivs, cviivs, cviivs ([23]), once QVIVS ([20]). D. QVOIEI, QVOI; once F. QVAI. Ab. QVEI. Plural: N. M. QVEI, but after 120 B.C., occasionally QVI; QVES, indefinite; F. and Ne. QVAI. G. QVOIVM.
DERIVATIVES OF quī AND quis.
[691]. The derivatives of quī and quis have commonly quis and quid as substantives, and quī and quod as adjectives. Forms requiring special mention are named below:
[692]. quisquis, whoever, whatever, everybody who, everything which, an indefinite relative, has only these forms in common use: N. M. quisquis, sometimes F. in old Latin, Ne. N. and Ac. quicquid or quidquid, Ab. M. and Ne. as adjective quōquō.
Rare forms are: N. M. quīquī, Ac. quemquem, once Ab. F. quāquā, as adverb quīquī, once D. quibusquibus. A short form of the genitive occurs in quoiquoimodī or cuicuimodī, of whatsoever sort.
aliquis or aliquī, aliqua, once aliquae (Lucr.), aliquid or aliquod, some one, some; Ab. M. sometimes, Ne. often aliquī ([689]). Pl. Ne. N. and Ac. only aliqua; D. and Ab. sometimes aliquīs ([668]).