Hi Ezzat! I'll do my best to explain but I don't think there are set rules for this particular quirk...
"The" and "a/an" are definite and indefinite articles. No article is used in the following cases:
- When referring to general ideas, plurals or uncountable nouns. E.G. --> "Mexican food is spicy" (NOT "The Mexican food is spicy.")
- Names of people, books and plays (unless it is part of the title). E.G. --> "I have read Romeo and Juliet."
- Towns, cities, states and countries. E.G. "Australia," "Tokyo," "China." (Exceptions – The USA, The UK, The Netherlands, The Czech Republic, The Philippines).
- Sports or games. E.G. --> "soccer," "tennis," or "chess."
- Meals. E.G. --> "breakfast," "lunch," and "dinner"
In addition, the "a/an" indefinite article is not used with possessive pronouns, demonstratives or cardinal numbers.
"My shirt is dirty."
"This car is expensive."
"One person is in the reception."
Use "one" (or whichever quantity of thing you're referring to) instead of "a/an" when the number is important.
"There is only one exit from the airport."
I hope that helps!
