Three equivalents of these four interrogatives are simple pronouns: kenha or ken 'who’, undi 'where’ and mó(di) or mo(di) 'how’. The equivalent of 'when’ consists of two parts: ki ténpu (variants ki dia, ki óra etc.), literally 'what time’ ('what day’,’what hour’). These interrogative pronouns are usually placed at the beginning of the sentence. If this is the case, they are mostly followed by a focalizing ki.
Source: Brüser et al. 2002: s.v. luxa, fase
Source: Lang et al. 2012
Source: Brüser et al. 2002: s.v. undi
Source: Brüser et al. 2002: s.v. módi