nā whai anō ...
1. so that's the reason, so that's why, it's no wonder, it's not surprising, that'll be why, well that explains it - an idiom used when someone has had something explained to them and they finally realise the reason. Similar to 'the penny's dropped'. Also as inā whai anō.
He whaiāipo tā Ngāhuia. Nā whai anō ia i kore ai e haramai i taku taha ki te pikitia. / Ngāhuia has a boyfriend. So that's the reason she won't come to the movies with me.
Ko te āhua nei e rangirua tonu ana ngā whakaaro o te kāhui ariki tae noa ki te pōtitanga o 1931, ā, nā whai anō rā i tarea tonutia ai e Piupiu a Eketone te tautoko (TTR 1996:254). / It would seem that the King's family were quite ambivalent extending into the 1931 election, and it's no wonder Piupiu was able to support Eketone.
Tau: I tae atu a Tama Purotu ki te pō kanikani. Ira: Inā whai anō i hiahia ai a Hinerera ki te haere (HJ 2012:48). / Tau: Tama Purotu arrived at the dance. Ira: So that's why Hinerera wanted to go.