AT: when we think of a place as a precise location, not an area. (The delivery man is __the back door.), to talk about an event with a number of people (Was Rashid __the seminar yesterday?), IN: when we think of a place as an area or space (He had his workshop __the basement of his house.), for cars and taxis, with things or people that form lines (she waited __the line)., with THE WORLD, ON: to talk about a position in contact with a surface (__the wall), with BORDER, COST, etc., with some means of transport, with technology (__the phone), with LEFT and RIGHT,

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