Unit 04
There is one language that is in use in every country in the world. The people who use it are young and old, thin and fat, short and tall. It is everybody's second language. It is easy to understand, although you can not hear it. It is sign language.
When you wave to a friend who is across the street, you are using sign language. When you smile at someone, you are saying, "I want to be friendly." but you are not using speech. You are using si
