What's this?
This is one foot
What's this?
This is one neck
What's this?
This is one leg
What are these?
These are two legs
What's this?
This is one nose
What's this?
This is one face
What's this?
This is one head
What are these?
These are two arms
What are these?
These are two ears
What are these?
These are two knees