c.  Quis, when limiting words denoting persons, is sometimes an adjective. 
  But in such cases quis homo = what man? whereas qui homo = what sort
  of man?

  d.  Quis and qui may be strengthened by adding -nam.  Thus:—­

Substantive:     quisnam, who, pray? quidnam, what, pray?
Adjective:       quinam, quaenam, quodnam, of what kind, pray?

* * * * *

VIII.  INDEFINITE PRONOUNS.

91.  These have the general force of some one, any one.

      SUBSTANTIVES.  ADJECTIVES. 
  M. AND F. NEUT.  MASC.  FEM.  NEUT.
  quis, quid, qui, quae, qua, quod,
  any one, anything. any.
  aliquis, aliquid, aliqui, aliqua, aliquod,
       some one, any.
       something.
  quisquam, quidquam, quisquam, quidquam,
  any one, anything. any (rare)
  quispiam, quidpiam, quispiam, quaepiam, quodpiam,
  any one, anything. any.
  quisque, quidque, quisque, quaeque, quodque,
         each. each.
  quivis, quaevis, quidvis, quivis, quaevis, quodvis,
  quilibet, quaelibet, quidlibet quilibet, quaelibet, quodlibet,
  any one (anything) any you wish
        you wish
  quidam, quaedam, quiddam, quidam, quaedam, quoddam,
  a certain person, or a certain
         thing.

1.  In the Indefinite Pronouns, only the pronominal part is declined.  Thus:  Genitive Singular alicujus, cujuslibet, etc.

2.  Note that aliqui has aliqua in the Nominative Singular Feminine, also in the Nominative and Accusative Plural Neuter.  Qui has both qua and quae in these same cases.

3.  Quidam forms Accusative Singular quendam, quandam; Genitive Plural quorundam, quarundam; the m being assimilated to n before d.

4.  Aliquis may be used adjectively, and (occasionally) aliqui substantively.

5.  In combination with ne, si, nisi, num, either quis or qui may stand as a Substantive.  Thus:  si quis or si qui.

6.  Ecquis, any one, though strictly an Indefinite, generally has interrogative force.  It has both substantive and adjective forms,—­substantive, ecquis, ecquid; adjective, ecqui, ecquae and ecqua, ecquod.

7.  Quisquam is not used in the Plural.

8.  There are two Indefinite Relatives,—­quicumque and quisquis, whoever.  Quicumque declines only the first part; quisquis declines both but has only quisquis, quidquid, quoquo, in common use.