 More generally, linguists such as Carlson (1995), Cohen (2001), and Greenberg (2003) have noted that generics can sometimes have a normative flavor, e.g. “a gentleman opens the door for ladies” or “boys don’t cry.” A connection between linguistic form (e.g., bare plural vs. indefinitely singular) and normativity is often drawn, with some theorists such as Greenberg (2003) and Cohen (2001) arguing that indefinite singulars can express only “rules and regulations”, in the sense of Carlson (1995).