places and propositions

IN or AT

• the mall
• the central park
• the bus station 

ON: used with the names of  streets and specific physical locations

• ....street
• the left
• the corner (could also be at the corner) 
• floor 
• Fisherman's Wharf is located ON the SF Bay
• Ghirardelli Chocolate is right ON Ghirardelli Square
• on the beach (we ate dinner on the beach)

AT: Used for buildings and addresses

• 25 Bay St.
• school
• work 
• home (I work at home. I work at the hospital) 
• the thatre
• the film festival

IN: used with the names of  the citities, countries, continents, and other large locations

• apartment (she lives in an apartemnt)
• office (I work in an office) 
• I am in school today.
• mexico
• the park
• the neighborhood
• in Oska
• classroom

Were you home last night?

Were you at the party last night?