Note. This construction is closely related to that explained in [§ 159]. “Whoever deserts you, I will remain faithful,” is practically equivalent to “Whoever deserts you, let him desert you! I will remain faithful.” No antecedent, however, is felt by the speaker, and hence none need be supplied in parsing. Compare concessive clauses ([§ 401]).

161. Which, what, whichever, and whatever are often used as adjectives.

162. A noun limited by the adjectives what, whichever, and whatever, may have the same double construction that these relatives have when they are used as pronouns ([§ 159]). Thus,—

Take whichever pen is not in use. [Here pen is both the direct object of take, and the subject of is.]

Whoso for whosoever and whatso for whatsoever are common in older English.

INTERROGATIVE PRONOUNS

163. The interrogative pronouns are who, which, and what. They are used in asking questions.[22]

164. Who has a possessive whose, and an objective whom. Which and what are not inflected.