Here are some examples:
* People: John, Mary, Queen Elizabeth II
* Places: London, Mount Everest, the Pacific Ocean
* Things: The Mona Lisa, the Eiffel Tower, the Constitution
Here's what makes proper nouns different from common nouns:
* Common nouns are general names for people, places, or things (e.g., woman, city, painting).
* Proper nouns are specific and unique. There is only one John, one London, and one Mona Lisa.
It's important to note:
* Titles of books, movies, and songs are also proper nouns and should be capitalized. For example: "The Lord of the Rings," "Star Wars," "Imagine."
* Days of the week, months of the year, and holidays are proper nouns. For example: Monday, January, Thanksgiving.
Understanding proper nouns is essential for correct grammar and writing.