Hi, Prepositions are not easy to learn, or easy to teach. (ie we say it that way because we say it that way) at - suggests you are thinking of school as a locatioo, as a place in - suggests you are thinking of school as an experience (when I was a student) I have just understood the differences between them. Please have a run through the examples belwo.
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Anonymous1. Back at school, I played a lot.OK.
AnonymousBack in school, there used to be a large playgroundOK as shown.there.
AnonymousBacktoat my school, I still can see