This monograph systematically investigates the Japanese ‘dative subject’ construction across time and space. It demonstrates that, in order to capture what speakers/writers know about how to put an utterance or a clause together, it is necessary to pay attention to what they do in actual language use and in different discourse types. The work also shows the importance of diachronic perspectives to help us better understand the ways in which a particular grammatical structure is represented synchronically. By utilizing modern Japanese conversation, contemporary Japanese novels, and a pre-modern and modern Japanese literature corpus, the study highlights the role of ‘dative subjects’ at the semantic and discourse-pragmatic levels. Specifically, it demonstrates that what has been considered to be a most ‘grammatical’ aspect of Japanese actually turns out to be rather pragmatically oriented.