follow with prepositions

I study at university. (Estudio en la universidad)

He is at home. (Él está en casa)

I always visit my sister at work. (Siempre visito a mi hermana en el trabajo)

She doesn’t like waiting at the metro stop. (A ella no le gusta esperar en la estación del metro)

At the table. (En la mesa -para trabajar o comer-)

The papers are at the top shelf. (Los papeles están en la estantería de arriba)

I’ll see you at the theatre. (Nos vemos en el teatro)

ON

Meaning: sobre, encima

Use: placed in front of place names based as tables, floors, etc ..., with names of places in a room as a ceiling, wall or ceiling to indicate that someone is inside a public transport or in plant building, to indicate the distance from one point to another.

Examples:

The pen is on the table. (El bolígrafo está sobre la mesa)

They have a picture of Paris on the wall. (tienen una foto de Paris en la pared)

It was the first time I was on a plane. (Era la primera vez que subía a un avión)