1. When it's part of a common noun:
* Example: "I live in the united states." (United States is a specific place, but "the" is a common noun)
2. When it's part of a title:
* Example: "The book is called the lord of the rings." (Here, "the" is part of the title, not the proper noun itself)
3. When it's part of an abbreviation:
* Example: "I work for ibm." (IBM is an abbreviation, so lowercase is used)
4. In some specific styles:
* Example: In some writing styles, like all-lowercase writing, everything is written in lowercase.
General Rule:
* Proper nouns (names of specific people, places, and things) always start with a capital letter.
Let me know if you have any other questions about capitalization!