Tēhea is used to ask ‘which’ when there is only one thing being asked about. Tēhea is placed before the thing you want to find out.
|Ko tēhea rā tēnei? ||Which day is this?|
|Ko tēhea iwi?||Which tribe?|
|Ko tēhea te maunga o Ngāti Porou?||Which mountain is Ngāti Porou’s mountain?|
|Nō tēhea iwi koe?||Which tribe are you from?|
|Ko tēhea rā o te wiki tēnei?||Which day of the week is this?|
Ēhea the plural form of tēhea is used to ask ‘which’ when there is more than one thing being asked about. Ēhea is placed before the noun.
|Ko ēhea whare e peitatia ana?||Which houses are being painted?|
|Kei ēhea tiriti ngā ākonga e noho ana?||Which streets are the students living in?|
|Ko ēhea tau i haere ai koe ki Hawai‘i?||Which years did you travel to Hawai‘i?|
For further explanations, examples and exercises see Te Kākano pp. 47, 100. Te Kākano Pukapuka Tātaki p. 57 and theTe Kākano CD’s Mahi 80, 82.