Logical Reflections on Subject in Japanese

As a basic logical reasoning form universal in human thinking,subject-predicate structure exists in all languages.Predicate necessitates a subject,and there is no predicate without a subject.Whether there is a subject or not in a sentence depends on its intrinsic nature,but not on its external representation.The nature of subject cannot be determined by the representation feature of the English subject and neither can the conclusion be drawn that no subject exists in Japanese.In Japanese,both ellipsis and expletive structure contain its logic subject.We recognize two kinds of elements in view of the structure of a verb phrase: nominative verb and thematic verb.The subject is determined by the verb phrases,so subject is divided into nominative subject and thematic subject.