Me i kahore ahau i pupuri, if I had not held.
3. Future.
Ki te pupuri ahau, if I should hold.
Ki te kore ahau e pupuri, if I should not hold.
In the Present and Past it is implied that the contrary to the alternative expressed is the fact. In the Future simple uncertainty is expressed.
1. With "kia".
Kia pupuri ahau, let me hold, or, in a dependent sentence, that I may hold.
Kaua ahau e pupuri, let me not hold.