If these pronouns occur in complete complementation (e.g. the subjective set preceding verbs and the objective following verbs), we should perhaps be inclined to consider the related forms as morphemic alternants, or allomorphs. [...] The situation in English is somewhat parallel. The forms 'I', 'we', 'she' stand in complementary distribution [...] with 'me', 'us', and 'her' respectively.
- Nida (1948), a pag.423