An interesting approach to the problem of parsing efficiency was using supertagging (Clark and Cur-ran, 2004b; Clark and Curran, 2004a; Wang, 2003; Wang and Harper, 2004; Nasr and Rambow, 2004; <cite>Ninomiya et al., 2006</cite>; , which was originally developed for lexicalized tree adjoining grammars (LTAG) (Bangalore and Joshi, 1999) .