Abstract
Cross-linguistically, there is polysemy of ‘with’ and ‘and,’ which is explained as development from the comitative to the conjunction. Formally, the development is captured as change of labels from DP to &P, which instantiates the emergence of a functional category. Coordination is decomposed into several factors, each of which changes independently. This explains several types of anomalous coordination where only some, but not all, factors have changed. Such anomalous sentences manifest the gradualness of language change, and close examination of them reveals that the change is not unidirectional but multi-directional.
