The article "the" is used before nouns in several contexts:
- Before nouns that are specific or unique, such as names of places, organizations, rivers, mountain ranges, oceans, etc.
- For nouns referring to parts of the day (morning, evening), seasons, historical periods, and proper nouns with "of".
- When the noun is definite or specific within the context, such as "What is on the desk?".
The articles "a" and "an" are indefinite articles used before singular nouns when first mentioned. The definite article "the" is used for nouns after the first mention to make them specific. The zero article is used without an article