Ogihara (1989Ogihara ( , 1996 furnish a solid basis on which researchers interested in formal aspects of this area of study can build up their own theories.
they are not an exhaustive study of tenses in Japanese subordinate clauses: the subordinate clauses taken up there are limited to relative clauses, the quotative clause marked by to and to yu, the temporal clause introduced by toki (when), mae (before), and ato (after), and nominalization by no and Moto.