Māori Grammar

Future possession can be denoted by the m-class of possessives. Typically, this is translated as something being "for" a person:

māku/mōku - for me
māu/mōu - for you
māna/mōna - for him/her

mā/mō tāua - for us two (you and me)
mā/mō māua - for us two (not you)
mā/mō kōrua - for you two
mā/mō rāua - for them two

mā/mō mātou - for us (three+, exclusive – not including you)
mā/mō tātou - for us (three+, inclusive – including you)
mā/mō koutou - for you all (three+)
mā/mō rātou - for them all (three+)

mā/mō Rangi - for Rangi
mā/mō Rangi rāua ko Mere - for Rangi and Mere

mā/mō te kaiako - for the teacher
mā/mō ngā tamariki - for the children

This uses the a and o categories for the object:

Māku tēnei kai.
This food is for me.

Mōku tēnei wai.
This water is for me.

Mā/mō describes "unrealised possession" where something is owned by a person but they have not yet received it. (An example might be where a person has bought a book online and have paid for it, but it is still being delivered and they have not yet received it.) 

Mō ngā tamariki tērā papa tākaro.
That playground is for the children.

This assumes that the children are not yet in possession of the playground as it shows future (not current) ownership. Perhaps the playground is still being built.

The m-class marks prospective possession - i.e., something that is intended, designated, set aside, or destined for someone. The person does not own it yet; it is merely allocated to them. The m-class is used for gifts you intend to give, meals you are about to cook for someone, and tasks you are assigned to do for someone.

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The difference between nā and nō

Nāku versus nōku

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You will be the one to do the dishes

Future possession and action using m-class possessives

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The food is for the hangi

mā and mō for things and events