I'm going to follow the old saying about a picture being worth a thousand words. These people are gathered "at" or "on" a corner. These children are sitting at a table "in" the corner.
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Vctory Ong(1) I also have a problem of the difference between saying "There are many people at the concert." and "There are many people in the concert."My ear only accepts "at" the concert. You could say "in" the concert hall.