English is the international language because it is language of the most powerful country.
Another reason is that English has many users all around world.
Many people can use it.
English is popular language.
the last important reason is that English is language of science.
English is {an} international language because it is {the} language of the most powerful country.
Another reason is that English has many users all around {the} world.
Many people can use it.
English is {a} popular language.
The last important reason is that English is {the} language of science.