Show:
Question
Answer
100

---->Pen

What is this?

100

What is this? 

It's a pen

200

--->         Pen

What is that?

200

What is that?

It's a pen

300

------>Pens

What are these?

300

What are these?

They are pens.

400

-------->          Pens

What are those?

400

What are those? 

They are pens.