Grammaticalization is one of the more visible emergent phenomena documented by usage-based inquiry, and Bybee acknowledges that studies of grammaticalization have led researchers to consider Usage-Based Theory more than any other emergent phenomena. This chapter gives an overview of grammaticalization and its ramifications, such as increased constructional autonomy due to repetition and the similarity of grammaticalization paths across languages. To illustrate how grammaticalization occurs, it focuses on present perfect periphrastic have constructions that express perfect aspect in Latin, Spanish, English and Portuguese, while noting that they occur in many other languages such as French, German, Romanian, and Dutch. The chapter then examines the diachronic emergence of the Spanish cognate haber as an auxiliary in the present perfect construction and its ongoing grammaticalization documented in sociolinguistic work using the variationist comparative method.
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