There is one common language in every country in the world All the people,old and young,men and women,must use it.It is everybody's first language It is easy to be understood,although you don't hear it.It is a sign language.
When you wave to your friends,you are using sign language.When you smile at others,you mean to be friendly.When you raise your hands in class,you are saying,“Please ask me I know the answer to the question.”When you put one finger in front of your mouth,you mean,“Silenee!”The deaf use sign language to talk to each other.There is even a university for the deaf in the United States.There are also TV programmes for the deaf people.They use sign language to tell everything.
(1)
The common language in every country is English.
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(2)
We can understand sign language easily.
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(3)
If you want others to be quiet,you can put one finger into your mouth.