just a word about formal and informal language - if we are having a conversation then there is some formality that we don't have to follow - i'll use Goren's sentence about Auckland as an example ...
tāone is not needed - in NZ everyone knows exactly what is meant by Tāmaki Makaurau"Kei te noho au a tāone Tāmaki Makaurau ināianei."
ināianei is also not needed - it is implied by what has already been said in the sentence
another example is the simple greeting - Kei te pehea koe? - i could simply say kei te pehea? or even pehea? because the rest of the sentence is implied
(it's kind of like saying 'sup? to someone - they know you're asking "what's up?")
(once again please excuse my missing macrons!)