I will run to the store (future tense)
Ka oma ahau ki te toa
I am running to the store (current tense)
Kei te oma ahau ki te toa
I was running to the store
I te oma ahau ki te toa
I ran to the store
I oma ahau ki te toa
I have run to the store
Kua oma ahau ki te toa
What is s/he doing?
E aha ana ia?