The purpose of this study is to re-examine the predicate clause focused on the distinction of the predicate clause with other embedded clause. There have been the assertions where predicate clause must be disused from the theoretical grammar, however, the predicate clause is still used from the school grammar. Once the predicate clause is established in the framework of embedded clause, there must be the expansive examinations which deal with the secondary embedding of predicate clause as well as the similarities and differences with other embedded clause. The main contents of this study are such as followings. First, `clausal marker` is examined from the function of embedded clause and the correspondence of `embedded clause/embedding sentence` expansively. the inconsistency and unsubstantiality of `the movement of the elements of the embedding sentence into the embedded clause` as the reason for the establishment of predicate clause are showed. Second, the problems of the recent assertion which considered `the predicate clause embedding sentence` as `topic subject predicate` are examined, in particular, if the `topic subject predicate` would be introduced to the framework of embedded clause, the unit of other embedded clause will be disintegrating. Third, the validness of the predicate clause is examined from the perspective of function. the expansive explanation mechanism for the semantic connection of the first noun phrase with the rest sentence is `predicate clause`. Fourth, the distinction of predicate clause with other embedded clause is examined. the nominal clause and adnominal clause can be secondarily embedded into the predicate clause and the similarities with the quotative clause are examined.