The most distinctive feature of this book among its contemporaries is the fact that it has introduced grammatical word class into meaning explanation, an approach which has greatly contributed to the transformation from the traditional philological studies to modem linguistics.

By introducing syntagmatic and paradigmatic relations and the related lexico-grammar notion and grammatiealization,the article argues that the the choice for constructiing language structure,which involves mental process,should be made on the basis of the knowledge of the different levels of meaning that the language units indicate.