When is proper to use in grammar?

"Proper" is an adjective, so it's not a word that gets directly used in grammar. However, it plays a role in grammar through the concept of proper nouns.

Here's a breakdown:

Proper Nouns:

* Definition: Words that name specific people, places, or things (e.g., John, London, the Eiffel Tower).

* Capitalization: Proper nouns are always capitalized.

* Use: They are used to refer to something specific, not a general category.

Examples:

* Incorrect: The city is beautiful.

* Correct: London is beautiful.

* Incorrect: I went to a museum.

* Correct: I went to the Metropolitan Museum of Art.

In summary, "proper" is used in grammar in the context of "proper nouns," where it refers to specific, capitalized names.

Let me know if you have any more questions!