These questions ask you to distinguish a fixed expression from an ordinary reference to a place or thing. Read the surrounding action closely: the same institution noun can change its article when the person's role changes.
Ask what role the noun is playing
Begin with purpose. In several established British expressions, no article marks participation in the usual activity associated with a place: a pupil attends school, a patient receives treatment in hospital, a prisoner is confined in prison, and someone in bed is there for sleep or rest. When the sentence instead treats the place as an identifiable building, the is normally required. If it introduces one unspecified building from a wider class, use a or an.
| Meaning signal | Article pattern |
|---|---|
| The usual institutional role or purpose | Use the established article-free expression, such as at school, in hospital or in prison. |
| An identifiable building or physical location | Use the, just as you would with another known place. |
| One institution introduced with a description, but not yet identified | Treat it as an ordinary singular countable noun and use a or an. |
| A means of transport after by | Use no article when naming the mode of travel. A particular service can take the. |
| Radio as a broadcast medium after listen to | Use the fixed phrase with the. This differs from the article-free expression with television. |
Do not make the decision from the institution noun alone. Identify the person's relationship to it, then ask whether later words describe a new member of a class or identify a place already known. In British English, the treatment expression with hospital is article-free; American English commonly uses the hospital for the same meaning.
The traps
| Tempting move | How to reject it |
|---|---|
| Adding the whenever an institution is familiar | A familiar concept is not necessarily a building reference. If the person is performing the institution's usual role, the established expression may be article-free. |
| Dropping the article whenever the noun names an institution | The article-free pattern depends on purpose. A visitor, volunteer or researcher going to a known building normally needs the. |
| Keeping an institution noun bare even when a following clause describes one place | Once the phrase introduces one countable place with a description, use an indefinite article unless the context already identifies it. |
| Choosing the merely because a description follows | A description can tell you what kind of place is meant without telling you which particular one. Use a or an for one not-yet-identified member of the class. |
Try it
By the time I got back from the airport, everyone else in the house was already in ___ bed and fast asleep.
- a
- an
- the
- (no article)
It is far quicker to get into town by ___ bus than to spend twenty minutes hunting for a parking space.
- a
- an
- the
- (no article)
My grandmother listens to ___ radio every afternoon while she does the ironing.
- a
- an
- the
- (no article)