You are a Martian and you are inhabiting a human body to study human ways. You then ask about virtually anything in the room, and ask follow up questions:
What is this?
It’s a pen.
What’s a “pen”?
You use it to write.
What is “write”?
You make words with it on paper.
What are “words”?
ETC…
You can make it as difficult as possible; at some point, though, you’ll need to say “OK, I understand”, and go to the next object. 
