Теория:

Study more information about the definite article and the zero article.
 
Обрати внимание!
We do not use the for general ideas.
 
Life is not possible without water.
  
There are some situations when we use the zero article.
 
1. proper nouns.
 
Kate comes from Spain.
  
spain-4522800_640.png
Рис. \(1\). Spain
 
2. names of sport, activities, colours, substances, meals.
 
Volleyball is my favourite sport.
  
volleyball-90896_640.png
Рис. \(2\). Volleyball
 
3. names of countries, cities, streets, parks, mountains, islands, lakes, continents.
 
My friend likes walking in Hyde Park.
  
london-1517309_640.png
Рис. \(3\). Hyde Park
 
4. the possessive case or possessive adjective.
 
This is not your coat, it's Sarah's.
  
5. titles with proper names.
 
President Kennedy was very popular among American people.
  
john-f-kennedy-153721_640.png
Рис. \(4\). John F. Kennedy
Источники:
Рис. 1. Spain, 2017, https://pixabay.com/images/id-4522800/ Pixabay License CC0 Free for commercial use No attribution required
Рис. 2. Volleyball, 2009, https://pixabay.com/images/id-90896/ Pixabay License CC0 Free for commercial use No attribution required
Рис. 3. Hyde Park, 2016, https://pixabay.com/images/id-1517309/ Pixabay License CC0 Free for commercial use No attribution required
Рис. 4. John F. Kennedy, 2013, https://pixabay.com/images/id-153721/ Pixabay License CC0 Free for commercial use No attribution required