On-line Te Reo Māori Dictionary

I haere au ki te pāka ki te hikoi.
I went to the park to walk.
Simple sentences: past tense - i

I haere au ki te pāka hei te hikoi.
I went to the park in order to walk.
Simple sentences: past tense - i

I haere te whānau ki te pāka kia tākaro ngā tamariki.
The family went to the park so the kids could play.
So that something can happen for someone else - kia

I haere au ki te pāka hikoi ai.
I went to the park to walk.
The reason for an action - ...ai.