noun
1
BAD : I've been in the hospital for the last five weeks.
GOOD : I've been in hospital for the last five weeks.
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See note at SCHOOL 1 (↑ school )
2
BAD : I want to go and see my grandmother who is ill at hospital.
GOOD : I want to go and see my grandmother who is ill in hospital.
BAD : It gave me the opportunity to work at a hospital.
GOOD : It gave me the opportunity to work in a hospital.
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in (a) hospital (NOT at ): 'I didn't like being in hospital.'