A thread for grammaticalization enthusiasts - I'm starting with the famous example of the grammaticalization spiral in Latin and romance languages (but any language is more than welcome): phrasal expression kanta bhumos from PIE fused into cantabimus which was followed by another periphrastic expression of cantare habemus (allegedly it evolved as an alternative to a similar construction with gerundive). And yet again, the fusion of that phrasal expression gives Italian canteremo, for example. A similar construction can be found in the majority of romance languages, apart from Romanian, for example, which still uses periphrastic future.
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