 The problem is that these seem modal. Rosen offers several possible responses the fictionalist could make to this problem. He could admit that his theory does indeed contain a modal primitive, but claim nevertheless that it is some sort of advance in analysis, reducing all modal primitives to one. (Though as Rosen says, “According to the fiction of possible worlds” seems like a very odd primitive.) Or he could instead attempt to spell out the prefix in a non-modal way. This has not to date been attempted by many avowed modal fictionalists, but is one of the many tasks facing a modal fictionalist who sees the invocation of the fiction as the method for analysing or explaining modality.