I don't know when to put definite and when to put indefinite article so I have few questions.

"This is a true story about a man who chose the worst possible time for his crime. It happened in London in the summer of 1972. The man stole a barge on the River Thames (in case you don't know, a barge is a river boat used for carrying goods). The owner of the barge soon discovered that it was missing and immediately informed the police so that they could look for it."

I thought definitions are written with zero article like: in case you don't know, barge is a river boat used for carrying goods.(only barge not a barge)

Why is there the owner when we are only now introduced to him. Shouldn't there be an owner?

Why is there the police and not just police?


"The" is used for the owner because there are actions he takes part in.

"The" before the police is used because the report went to some actual police station or a group of policeman. In this case, the word "police" don't summarize all police.

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