Changing Pronouns

Look carefully at the chart in your book.  The K words - koe, kōrua and koutou change when the answer is given:

How are you?  I am good.   =   Kei te pēhea koe?  Kei te pai ahau.

How are you two?  We are both good.     =    Kei te pēhea kōrua?  Kei te pai māua.

How are you fellas?  We are all good.     =    Ket te pēhea koutou?  Kei te pai mātou.

All the other pronouns in the last two sections remain the same from the question to the answer.  

How is she?  She is great.   =   Kei te pēhea ia?  Kei te pai ia.

How are we all?  We are all tired.   =  Kei te pēhea tātou?  Kei te ngenge tātou.