The definite article "the" is used to refer to a specific place (or other noun), often one that has been previously mentioned. "A school" could be any school, "the school" is a particular school that you have already talked about, or that you and the listener know is being spoken about.
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eapoealthough the place being talked about is definite or known by the interlocuters, people still say "at school" so in this case we cannot really take it for granted that definite article "the" is used when the place is known by the speaker and listener.In both "at the school" and "at school", the particular school may be known to both speakers. In "at sch
MY ANSEWR MIGHT GO OFF A LITTLE FROM FORMAL TECHING, AS I USUALLY GO AFTER PATTERNS AND THE PATTERN THAT SEEMS TO POP UP IS THAT IF THE NOUN YOU TALK ABOUT IS A RATHER ATTACHED PLACE/ACTIVITY (ATTACHED TO THE SPEAKER THAT IS) OR IS IT HABITUAL, AND HAS A SENSE OF BELONGING, THEN YOU DONT HAVE THE NEED FOR THE DEFINITE ARTICLE. eg: at home, at school, at work.
ON THE OTHER HAND THE
I think that if we are talking about the concrete school so we have to write at the school like in the text https://www.curriki.org/oer/How-to-Hone-Your-Interpersonal-Skills-in-College if we are talking about some not concrete school so we should write at a school!