The essence of grammaticalization is the evolution of a lexical category to a grammatical one or of a hybrid/functional category to another grammatical category. The first involves changes such as that of the verb have from “possess” to the marker of the perfect tense. The second involves changes such as that of to from a preposition (a hybrid category in English) to an infinitive marker or such as that of a demonstrative (e.g., the Latin ille ‘that’) to a definite article (the Italian il, the Spanish el, and so on). These changes have attracted attention for hundreds of years and are very well known. More recently, additional conditions and stipulations have been placed on this leading idea, but the essence remains the same.
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