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"Were you at school yesterday?

Does it mean " took a lesson in the school" or "just went to the school"?

Thanks in advance.
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DarcyDoes it mean " took a lesson in the school" or "just went to the school"?
It means "Were you participating in school activities yesterday?" It might be classes (lessons) or it might be other school activities such as sports practice or musical rehearsals. Being at school is not so specific as to mean lessons only.

CJ
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Generally speaking, it would mean that you attended classes, but you might have other reasons for being there. You might be the janitor, or the cook at the cafeteria.

Others would usually say, "I was at the school."