tā koutou - your (singular, addressed to three or more people)
He aha tā koutou mahi i te marae i te Rāhoroi?What were you guys doing at the marae on Saturday?What are you doing? - He aha tāu mahi?
He pātai tā koutou?Do you have a question?Possessives - 'a' class - ā, tāku...
Ka pānui au i tā koutou pukapukaI will read your book that belongs to you all
He aha tā koutou e pīrangi nā?What do you all want?
He aha tā koutou e rapu nā?What are you all looking for?
Kia pai tā koutou nohoI hope you have a good stay
He aha tā koutou mahi inanahi nei?What did you guys (3 or more) get up to yesterday?
He aha tā koutou mahi i te kura i tēnei rā?What did you guys get up to at school today?
He aha tā koutou mahi i te marae i te Rāhoroi?What were you guys doing at the marae on Saturday?
Kia tika tā koutou whakapai moenga!You must make your beds properly!
I pai tā koutou waita.Your (3+) singing was good.