On-line Te Reo Māori Dictionary

Mā te hita tātou e whakamahana.
The heater will warm us up.
Future agent emphatic - māku

Ka whakamahana au i te kai.
I will warm the food.
Pronouns - singular - au, ahau

Ko te rā, ko te marama hei rama, ā, ko te ahi hei whakamahana i a mātou.
The sun and the moon were our lights, and the fire was all we had to keep us warm.
Conjunctions - and - ā

Whakakāngia te whakamahana.
Turn on the heater.