Allen and Greenough's New Latin Grammar for Schools and Colleges
J. B. Greenough, G. L. Kittredge, A. A. Howard, Benj. L. D'Ooge, Ed.

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[*] 149. The Indefinite Pronouns quis, any one, and quī, any, are declined like the corresponding Interrogatives, but qua is commonly used for quae except in the nominative plural feminine:—

SUBSTANTIVE:	quis , any one; quid , anything.
ADJECTIVE:	quī , qua ( quae ), quod , any.

[*] a. The feminine forms qua and quae are sometimes used substantively.

[*] b. The indefinites quis and quī are rare except after sī , nisi , nē , and num , and in compounds (see § 310. a, b).

[*] Note.--After these particles quī is often used as a substantive and quis as an adjective (cf. § 148. b. N.).

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Case-Forms of quī and quis