ARTICLES

1. INDEFINITE A/AN

1.1. for something general or non-specific

1.1.1. when refer to something for the first time

1.1.1.1. to refer to someone’s job or function

1.1.1.1.1. to mean one

2. DEFINITE THE

2.1. it is clear which thing/person we are referring to

2.1.1. it may have been mentioned before

2.2. to refer generally to some geographical locations

2.3. to refer to a type of musical instrument

2.4. to refer generally to public transport and other services

2.5. with adjectives used as nouns for groups of people

3. NO ARTICLE

3.1. with plural and uncountable nouns with a general meaning

3.2. in certain phrases which relate to a type of place or institution, but not a specific one

3.3. be in / go to church, court, hospital, prison, bed

3.4. be at / go to sea, school, university, college, work be at / go home