Learner uses the when the reader can identify which one is meant, and can name which of the two reasons makes it identifiable.
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Six sentences. Decide whether the reader can identify the thing.
Which is correct?
The three reasons a reader can identify something, and the case where none applies.
The points at something.
It tells your reader: you can identify this one.
If your reader cannot, the word is wrong.
There are three reasons a reader can identify something. Every correct the uses one of them.
You can only point at something the reader can find.

You can only point at something the reader can find.
Twelve phrases sorted by why the reader can identify them.
Sort each item into the correct category
Three worked chains. Answer the question before choosing the article.
1. I bought a car last week. ______ car was cheap.
Can the reader tell which car?
So the article is .
2. ______ pollution is a serious problem in large cities.
Can the reader tell which pollution?
So the article is .
3. This is ______ only solution that works.
Which word makes it the only one?
So the article is .
Ten gaps. Five things named twice, plus two general nouns.
Last month I visited small town in the north.
town had one school and one shop.
I stayed with teacher from the school.
teacher had lived there for thirty years.
She showed me old map of the area.
map was drawn in 1890.
In the evening we watched film about the region.
film was slow but beautiful.
She said that tourism has changed the town.
She also said that young people now leave for the cities.