Question

alguin me puede explicar como usar correctamente la preposisiones in , on y at en ingles

Answer 1

“IN”
*Espacios cerrados: in my room, in the living room, etc.
*Dentro de objetos: in the box, in the book, etc.
*Ciudades y países: in London, in Germany, etc.
*Períodos de tiempo: in 2012, in December, in Spring.
*Partes del día: in the morning/afternoon/evening. 

“ON”
*Días especiales: on my birthday, on Christmas Day, etc.
*Días de la semana: on Monday, on Sunday, etc.
*Sobre superficies: on the table, on the beach, etc.
*Medios de transporte: on a bus, on a plane, etc.
*Fin de semana: on the weekend, on weekends

“AT”

*Lugares comunes: at home, at school, etc.

Lugares específicos: at Natural History museum, at the Cambridge University, etc.

Direcciones y domicilios: at 2393 Colon Square.

Sitios concretos de un establecimiento: at the door, at the window, etc.

Citas y acontecimientos: at the party, at the meeting, etc.

Horas y momentos determinados del día: at 4:00 am, at midnight, etc.

Fin de semana: at the weekend, at weekends