He aha tena? (macron required above the e and a in tena)
What is that? (referring to something that is next to the person being spoken to)
He penerakau tenei - This is a pencil
This is a pencil - The person being spoken to replies.
The same structure can be used with any classroom object. All that is required is to replace the question word 'aha' with name name of the object that the question is being asked about.