Subject and object are a pair of important philosophical categories. This article applies this pair of concepts to linguistic analysis to differentiate the concepts of coding subject and object, decoding subject and object, and subject and object in the syntactic structure of the clause. In situational contexts, language activities are carried out in the encoding, decoding and transmitting of information, involving the encoding subject and object and the decoding subject and object, where the relationship between subject and object is reflected in the interaction between the speaker and addressee; in the language system, the relationship between subject and object is reflected in encoded content, involving the subject and object in the syntactic structure of the clause and the demarcation point between subject and object. On this basis, a contrastive study of the syntactic realizations and semantic functions of the Predicator in the English, Chinese and Arabic clause is carried out, the aim of which is to reveal the subject-object relationship implicated by the Predicator in the three languages. The results show that the syntactic realizations and semantic functions of the Predicator in the English, Chinese and Arabic clause are featured with different degrees of separation or integration between subject and object. English is featured with the separation between subject and object, Chinese with the integration of subject and object, and Arabic with a higher degree of the separation between subject and object than English. Such subject-object relationships in the three languages are coupled with the basic philosophical thinking modes of the three nationalities. Generally speaking, the English people favors the Western ‘Subject-Object Dichotomy’, the Chinese people the ‘Unity of Man and Nature’, and the Arab people a stricter ‘Subject-Object Dichotomy’ due to the religious ontology of Islam.