Abstract Abstract: Despite numerous studies on the diachronic process and evolutionary mechanisms in grammaticalization, few interpretations are found on the motivations and governing principles in this evolutionary process. To address the problem, this study argues that in the process of grammaticalization subjectification and politeness reflect the autonomy of speakers, while the triggering factors in language evolution, such as metaphor, metonymy and economy indicate the rationality of speakers. Also, the pragmatic principles could exert an influence on grammaticalization, since the autonomy principle is based on subjectification and politeness. The pragmatic economy principle could also offer convincing interpretations to grammaticalization. The intercommunity between language and parole is in line with the hypothesis of the key role played by pragmatic inferencing in grammaticalization, which has also justified the reasonability of the syntax-pragmatic interface study.
Key words: language evolution; grammaticalization; autonomy principle; economy principle
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