[Shilluk] In the pronoun three forms may be distinguished by tone alone; 'e' 'he' has a high tone and is subjective, '-e' 'him' (e.g., 'a chwol-e' 'he called him') has a low tone and is objective, '-e' 'his' (e.g., 'wod-e' 'his house') has a middle tone and is possessive.
- Sapir (1921), a pag.80

From the verbal element 'gwed-' 'to write' are formed 'gwed-o' '(he) writes' with a low tone, the passive 'gwet' '(it was) written' with a falling tone, the imperative 'gwet' 'write!' with a rising tone, and the verbal noun 'gwet' 'writing' with a middle tone.
- Sapir (1921), a pag.80