hei
1. (particle) at, in, on, with - sometimes used of future time or place.
(Te Pihinga Textbook (Ed. 2): 48;)
See also hai
2. (particle) Used with kinship terms to show relationships.
(Te Pihinga Textbook (Ed. 2): 54;)
See also hai
3. (particle) for, to, as, as a means of - denoting future purpose, intention, etc. In this usage hei is followed by active transitive verbs, but is not used with intransitive verbs, verbs in the passive or with statives.
(Te Kākano Textbook (Ed. 2): 76;)
Anei te oka hei tapahi i te mīti. / Here is the butcher knife to cut the meat.
4. (particle) replaces e to form a negative imperative with kaua.
(Te Kākano Textbook (Ed. 2): 67; Te Pihinga Study Guide (Ed. 1): 40-41;)
5. (particle) replaces e in the future grammatical structure to emphasise the agent of an action.
Ka riro mā te wai hei whakanoa. / It is the water's job to remove the tapu.