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Take note: school/university, etc.
There is a special rule for these places: school, university, college, hospital, prison, church.
Compare these examples:
The children go to school by bus.
I go to the school to help twice a week.
Ben's studying maths at university.
He works in the canteen at the university.
She was in hospital for three weeks.
Is there a shop in the hospital?
If someone is at the place because they are a student / are sick / a prisoner, etc, we don't use the. If they are there for another reason, or we are talking about the building, we use the.