English comparative modals are combinations of the adverbs rather, sooner and better with an auxiliary. There is recent consensus that the comparative modals RATHER and SOONER have over time developed a different syntax and semantics than BETTER. However, potential differences in the syntax of RATHER and SOONER with respect to patterns of complementation haven’t been explored. This article reports the results of a corpus study of these two modals and finds that RATHER patterns like object-raising verbs, allowing a range of complements that are unavailable for SOONER. Our analysis of these patterns draws on recent work in the Construction Grammar framework, with forays into its formal implementation, Sign-Based Construction Grammar, and we propose that RATHER differs from SOONER in that it constitutes a micro-construction whose features are licensed by both the Modal Construction and the Object-Raising Construction, the latter a subtype of the Transitive Construction.