We use the indefinite article, a/an for:
– single countable nouns mentioned for the first time:
There’s a cat under the car.
He’s a police officer.
We use the definite article, the for:
– previously mentioned nouns:
She came over to me and gave me a present and a card. The present was wrapped in beautiful paper.
– when there’s only one of something:
I would really love to go to the Moon.
We use no article for:
– most languages, names, streets, towns, cities, countries (except the USA, the UK):
I’m going to learn French and Italian at school.
I’m going to invite James to the party.
I live in Nelson Road, in Campbridge.
The whole family have emigrated to Argentina.
I’ve lived in the UK all my life.
– uncountable nouns, plural nouns and abstract nouns:
I’m going to buy bread and milk.
It’s difficult to find accommodation around here.
I like cats but I don’t like dogs.
She gave us very good advice.