* As a language: No, it is not a proper noun. It's a common noun referring to the language itself.
* Example: "I am learning the English language."
* As a nationality: Yes, it is a proper noun. It refers to the people of England and their culture.
* Example: "She is English."
* As a specific place: Yes, it can be a proper noun. It can refer to the country of England or a specific region within England.
* Example: "We visited England last summer."
* Example: "He lives in English Yorkshire."
Therefore, the answer is it can be both a proper noun and a common noun depending on its usage.