#1 English language is beautiful.
#2 The English language is beautiful.
Could someone tell me which sentence above is correct? And please explain the reason. Thanks!
In both sentences "language" takes an article.
# English is a beautiful language!
# The English language is beautiful!
The first (indefinate) is referring to English as one of the beautiful languages, and the second is referring to English (in particular) as being a beautiful language.
In both cases the adj English plays a modyfing role: it modifies the noun language.
I am not a teacher.
Marciobarbalho and Colloquium:
Thank you for your replies. I've understood.
One little comment. In the sentence "English is a beautiful language", "English" is a noun.
The English language is a kind of exception. Cf.: English history, English literature, etc.