A ‣ Parts of the body 
The outer part of the body is covered in skin. Too much sun is bad for your skin.

B ‣ Movements with your mouth, face and head
People breathe through their nose or mouth. You breathe in and out about 12–15 times a minute.
People smile when they’re happy, and sometimes smile at people to be polite.
People laugh at things which are funny.
People sometimes cry if they’re very unhappy, or receive bad news.
People in some countries nod their head [move it up and down] to mean ‘yes’, and shake their head [move it from side to side] for ‘no’ .
People often yawn when they’re tired, and sometimes when they’re bored.
C ‣ Common expressions