Las preposiciones in, on, at (tiempo y lugar)

in 2020, on Monday, at 5 o'clock; in Madrid, on the table, at home.

Preposición	Uso	Ejemplos
at	hora exacta, momentos fijos	at 5 o'clock, at noon, at night, at the weekend (RU)
on	días y fechas	on Monday, on 3 May, on my birthday
in	meses, años, estaciones, partes del día	in May, in 2020, in summer, in the morning

Preposición	Uso	Ejemplos
in	dentro, ciudades, países	in the box, in Madrid, in Spain
on	sobre una superficie	on the table, on the wall, on the second floor
at	un punto, un lugar de actividad	at home, at work, at school, at the station

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