The prepositions 'in', 'on' and 'at' can be useful ... We use 'at' when we’re talking about a specific place or location. "I am at the park." We use 'on' when we're talking about streets or ...

We use prepositions of location such as 'in', 'at' and 'on' to show the position of objects in the sentence. We use 'at' for specific addresses or a specific place. 'He was at the department store ...