"At, In, On" I don't know how to use these preposition appropriately. When I'm writting in English, I always think which way is the best to use following prepositions. At, In, On For example: I work as a secrately at my company. I work as a secretaly in my company. I work as a secretaly on my company. I think there has almost same meaning. I want to know what are different of there words? And I want to get example within these prepositions.