Historical Processes and Grammaticalization
As languages change, the vector or light verb may retain its original meaning to different degrees of bleaching, part of the process of grammaticalization. Thus, in the Hindi compound nikal paRā (exit+fall), paRā has almost none of its "fall" meaning, though some of the finality of the fall also is transferred as a perfective aspect. On the other hand, the Japanese "hajimeru" (start) retains a good deal of its independent word meaning even in the compound.
In the long run, it has been suggested that LVs that are particularly frequent, may become grammaticalized, so that they may now occur systematically with other verbal constituents, so that they become an auxiliary verb (e.g. the English verb "be", as in "I am eating", or "had" in "they had finished"), or, after sound change, even a clitic (a shortened verb, as in "I'm"). In particular, some verb inflections (e.g. Latin future tense inflections) are thought to have arisen in this manner.
Read more about this topic: Compound Verb
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