The interaction of suppletion, defectiveness and periphrasis In a classical (in both senses!) paradigm all the forms are built from the same lexical base by the addition of various affixes and/or the operation of morphological processes. Two departures from this canonical state of affairs which have attracted considerable theoretical interest in recent years are SUPPLETION and PERIPHRASIS. The former is exemplified by French vais ‘go.1SG.PRES’, allons ‘go.1PL.PRES’, irons ‘go.1PL.FUT’, the latter by French suis/sommes allé(s)‘go.1SG/PL.PERF’. Less attention has been paid to connections between these two phenomena. In the present paper we explore the relations, both diachronic and synchronic, between suppletion and periphrasis and their relation in turn to a third concept, namely DEFECTIVENESS. We begin with the pair most widely studied in the traditional literature, namely suppletion and defectiveness, for which a strong diachronic claim is made by Strunk (1977:3) ‘Suppletion setzt durchweg Defektivität voraus, ohne daß umgekehrt Defektivität notwendig und immer von Suppletion begleitet wäre.’ As long as we remain within the domain of morphological formations, the historical record seems to bear out Strunk’s claim. Functionally, however, a periphrasis may also serve to remedy a paradigmatic gap, as in the often discussed case of Latin perfective passives (Börjars et al 1997, Sadler & Spencer 2001). Does Strunk’s hypothesis still hold? We argue that it does and that periphrases are only integrated into paradigms when a structural gap requires to be filled. This circumstance is exemplified in the rise of Romance periphrastic passives and perfects leading to complex paradigmatic oppositions between for example French il tue ‘he kills’/il est tué ‘he is killed’/il a tué ‘he has killed’/il a été tué ‘he has been killed’. In such a case the integration of the periphrasis generates a further gap since the periphrastic passive requires there to be a past participle of the passive auxiliary être ‘be’ in the perfect il a été tué, yet the Latin verb esse ‘be’ did not have a past participle. Suppletion is one means of solving the problem, exactly as predicted by Strunk, with the required past participle being borrowed from the verb stare ‘stand’, whence French été and Italian stato, or from sedere ‘sit’, whence Spanish and Portuguese sido. The alternative is to have recourse to analogy as in Old Italian suto (< *ess + uto). An important difference between suppletion and periphrases is that the latter may arise spontaneously even in the absence of defectiveness via well studied mechanisms of grammaticalization (see for example the material collected in Heine 1993). Prior defectiveness is not therefore a constraint on the generation of periphrases but only on their incorporation into paradigms. This in turn requires us to be able to distinguish when a periphrasis is part of a paradigm and when it is not. A relevant principle here is proposed by Ackerman & Stump (2004: 128) under the name FEATURAL INTERSECTIVITY, namely that a periphrasis is only part of a paradigm when there are related synthetic or morphological formations. This principle also finds its diachronic explanation in Strunk’s hypothesis since a periphrasis can only be integrated into a domain where morphological defectiveness holds, and this is a fortiori impossible if there are no morphological formations in the first place. This in turn yields the prediction that a paradigm made up purely of periphrastic formations is not possible, not for conceptual reasons but because there would be no diachronic route by which it could arise. We conclude with a discussion of two possible counterexamples to this claim, namely the co-verb constructions of some Australian languages (Schultze-Berndt 2000) and the pronoun system of the Amazonian language Wari’ analysed by Everett (2005). REFERENCES Ackerman, Farrell, and Stump, Greg. 2004. Paradigms and periphrastic expression: a study in realization-based lexicalism. In Projecting morphology, eds. Louisa Sadler and Andrew Spencer, 111–157. Stanford, Ca: CSLI Publications. Börjars, Kersti, Vincent, Nigel, and Chapman, Carol. 1997. Paradigms, periphrases and pronominal inflection: a feature-based account. In Yearbook of Morphology 1996, eds. Geert Booij and Jaap van Marle, 155–180. Dordrecht: Kluwer. Everett, Daniel L. 2005. Periphrastic pronouns in Wari'. International Journal of American Linguistics 71: 303-326 Heine, Berndt. 1993. Auxiliaries; cognitive forces and grammaticalization. Oxford: Oxford University Press. Sadler, Louisa, and Spencer, Andrew. 2001. Syntax as an exponent of morphological features. In Yearbook of Morphology 2000, eds. Geert Booij and Jaap van Marle, 71– 96. Dordrecht: Kluwer. Schultze-Berndt, Eva. 2000. Simple and complex verbs in Jaminjung. Nijmegen: Max Planck Institute. Strunk, Klaus (1977) Überlegungen zu Defektivität und Suppletion im Griechischen und Indogermanischen. Glotta 55: 2-34.