This paper is an analysis of the inner structure of Indoeuropean pronominal adverbs, including the simplest suffixed forms as well as compounds and derived forms; the authoress aims also at an elucidation of the syntagmatic relations of their constituents and a reconstruction of the different stages of their history from the point of view of word formation, morphonology and morphosyntax, in order to arrive at original systems sometimes showing a very different situation from the traditionally accepted.