What is it?
a foot - on
What is it?
a helicopter - by
what is it?
a skateboard - by
What is it?
a bike - by
What is it?
a bus - by
What is it?
a boat - by
What is it?
a car - by
What is it?
a plane - by
What is it?
a motorcycle - by
What is it?
a train - by