49 - Checking & indicating understanding

A: Fly away, balloon!

B: Don’t be silly! Your balloon won’t fly   away like that.

A: Why not? The balloons in that cartoon flew away with a house attached to them.

B: Those balloons were filled with a gas

called helium. Helium is lighter than air, so it

makes the balloons rise. Are you following

me?

A: Not quite. Sorry! I just can’t get my head

around it.