Formal:
* kei hea ahau e noho ana? (literally: "where am I living?") This is a grammatically correct and formal way to ask where someone lives.
Informal:
* kei hea koe e noho ana? (literally: "where are you living?") This is a more informal way to ask someone where they live.
* kei hea to kainga? (literally: "where is your home?") This is a more casual way to ask someone where they live.
Other options:
* noho ana ahau ki... (literally: "I live in...") followed by the place name.
* ko... taku kainga (literally: "... is my home") followed by the place name.
Example:
* Kei hea koe e noho ana? (Where do you live?)
* Noho ana ahau ki Ōtautahi. (I live in Christchurch.)
Remember that Māori is a living language, and there are often multiple ways to say the same thing. The best way to learn is to practice with native speakers and immerse yourself in the language.