When to use 'When'?

Kia ora! This week covers 'When'. I had many examples to cite from Harlow. Hopefully it makes sense and you find it useful.Harlow, A Maori Reference Grammar. pg 216Kia - Kia mutu te ua, ka haere nga tamariki ki waho takaro ai. [When the rain stops, the children will go outside to play.]Ina - Ina kite koe i a ia, me mihi. [When you see her, say hello from me.]Kia ... ka - Kia mutu nga whaikorero, ka haere mai te manuwhiri ki te hariru. [When the speeches are over, the guests approach to meet the hosts.]Ana - Hiki ana te hui, hokihoki ana nga tangata ki o ratou kainga.When the meeting closed, eveyone whent home (past)When the meeting closes, everyone goes home (general statement)When the meeting close, everyone will go home (future)Ka ... ana - Ka tae ana te ope, ka powhiritia. [When the party arrives, they will be welcomed.]No to ratou taenga atu ki te marae, ka kite ratou kua timata ke te hui. [When they arrived at the marae, they saw that the meeting had already begun.]