A Linguistic Study of the English Verb, Longmans, 1965. Radford. A. 1997. Syntactic Theory and the Structure of English: A minimalist approach. Cambridge, UK: Cambridge University Press. Radford, A. 2004. English Syntax: An introduction. Cambridge, UK: Cambridge University Press. Rowlett, P. 2007. The Syntax of French. Cambridge, UK: Cambridge University Press. Sag, I. and T. Wasow. 1999. Syntactic Theory: A formal introduction. Stanford, CA: CSLI Publications. Tesnière, L. 1959. Élements de syntaxe structurale. Paris: Klincksieck. Warnant, L. 1982. Structure syntaxique du français. Librairie Droz. Warner, Anthony R., English Auxiliaries, Cambridge Univ. Press, 1993. External links Auxiliary Slang English modal and auxiliary verbs