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(particle) A particle with no English equivalent used when talking about something specific and used before proper names, pronouns and common nouns preceded by a definitive
(ref: Māori Dictionary)
(Personal noun) in reference to a person name. who? or whom?.
example: Change (wai) to Ihaia
(ref: Māori Dictionary)
Tāku - (determiner) my (referring to one thing) - often followed by a noun but can stand without one.
Used in these ways listed above when the possessor has control of the relationship or is dominant, active or superior to what is possessed.
Tōku - (determiner) my (referring to one item) - a possessive often followed by a noun but can stand without one.
Used in the ways above when the possessor has, or had, no control of the relationship or is subordinate, passive or inferior to what is possessed.
(ref: Māori Dictionary Online )