The dependency analysis of long Japanese sentences is one of the unsolved problems in Japanese processzing. Long sentences with subordinate clauses whose dependency relationships are uncertain cause failure of analysis or explosions of ambiguity. This paper proposes a classification of subordinate clauses into 6 types and predicates into 4 types (transitive, intransitive, adjective, and copula) based on the form of expressions such as type of conjugative, type of particle, with/without comma. Applied to 970 newspaper sentences, this method resolves 90% of ambiguous relations among subordinate clauses.