In LSC the paradigm of interrogative pronouns consists in the following forms: who, what, which, where, how, why, when and how much/many. The sign when is articulated in different locations depending on whether it refers to the past or to the future. Likewise, the how many can adopt different forms depending on the referent that is being talked about [SYNTAX 1.2.3.2].
In LSC some interrogative pronouns are used also used for indefinites. For instance, the interrogative pronoun who is also used for the indefinite ‘someone’ when it appears with the third person plural pronoun (who^ix3pl[up]) or with the determiner some (who^some[up]) [LEXICON 3.7.7].