The prepositions at, on, and in
We use at to show a specific place or position.
For example:
Someone is at the door.
They are waiting at the bus stop.
I used to live at 51 Portland Street.
We use on to show position on a horizontal or vertical surface.
For example:
The cat sat on the mat.
The satellite dish is on the roof.
We also use on to show position on streets, roads, etc.
For example:
I used to live on Portland Street.
We use in to show that something is enclosed or surrounded.
For example:
The dog is in the garden.
She is in a taxi.
Put it in the box.
We also use in to show position within land-areas (towns, counties, states, countries, and continents).
For example:
I used to live in Nottingham.
I used to live in Nottingham.