 Another idea, considered in Heim (1990), Ludlow (1994), and Elbourne (2005) is to see how descriptive theories of pronouns fare when embedded within an event-based (or situation based) theories of conditionals like those articulated by Berman (1987), Kratzer (1989), and Lycan (1984). On an event-based analysis of conditionals, we would expect a treatment of (19) along the lines of (21).