1. (pronoun) we, us, he/she and I, him/her and me - like all pronouns and personals, takes a when following ki, i, kei and hei but does not take a when used as the subject of the sentence. Never occurs after he, te and ngā.

(Te Kākano Textbook (Ed. 2): 13, 31-32, 52-56, 64-65;)