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- The mysterious loss of the high-frequency verb weorðan 'become' as a casualty of changing word order in narrative during Middle English.
- The merger of is 'is' and bið 'shall be, is generally' into a single suppletive verb, and how it is related to the development of a general analytic future shall be.
- The co-occurrence of multiple changes that led to become and wax crossing a threshold of similarity with existing copulas, from which they analogically adopted full productivity in one fell swoop.

In explaining each of these changes, Petré goes beyond the level of the verb and its complements, drawing attention to analogical networks and the importance of a verb's embeddedness in clausal and textual environments.

Using a radically usage-based approach, treating syntax as emerging from (changing) frequencies, Petré draws attention to general principles of constructional change, including but not limited to grammaticalization and lexicalization. He proposes novel parallelisms between linguistic and ecological
evolution. Going beyond the view of language change as propagating only in social interaction, Petré explains how each individual's mental grammar can be seen as a dynamic ecosystem with hierarchical environments (clausal niches, textual habitats). In this view, the interconnectedness of seemingly
unrelated changes, itself resulting from cognitive economy principles, is arguably more decisive in lexical change than is functional competition.