The present paper is an attempt to describe and reorganize the usage of Japanese particles wa and ga and to give it a theoretical interpretation.
The author maintains that two elements are involved for sentence formation, i. e. Sentence Kernel and Sentence Frame. Wa is one realization of the Sentence Frame and thus completes sentence formation. Ga is only a component of the Sentence Kernel. A Sentence Kernel has the semantic function as a dictum, i. e. the core material of a Sentence. It is shown that the special constraint on the usage of “near-sentences”containing ga but not any Sentence Frame follows from this hypothesis.