Do you know? There is one language  in every country in the world. People, young and old, short and tall, thin and fat, use it very often. It is everybody's second . It is very easy to u, though you can't it. It is the sign language.

When you wave(挥手示意) to a friend in the street, you are using sign language. When you  up your hand in class, you are saying," Please ask me. I think I know the answer." or "I have some questions ." When you smile to someone, you mean to be  to him. When you put forefinger(食指) in front of your mouth, you mean," quiet, please." When a policeman wants to  cars or buses, he raises his right arm. Sign language is very useful in quiet places or places  of noise. It is different from body languages.

You speak, write a letter, or make a telephone. Your words carry a message. People communicate with words. But do you know people also communicate without words? A smile on your face shows you are happy or friendly. Tears in your eyes tell others that you are sad.

When you put up your hands in class, the teacher knows you want to say something or ask questions. You shake your head and people know you are saying: "No". You nod and people know you are saying "Yes". Other things can also carry messages. For example, a sign at the bus stop helps you to know which bus to take. A sign on the door tells you where to go in or out. Have you ever thought that there are a lot of signs around you and that you receive messages from them all the time? People can communicate in many other ways. An artist can use his drawings to tell about beautiful mountains, the blue seas and many other things. Books are written to tell you about all the wonderful things in the world and also about people and their ideas. Books, magazines, TV, radio and films all help us communicate with others. They can help us to know what is going on in the world and what other people are thinking about. 

Ways of Communication