Level A1
Prepositions
In for inside, months and years; on for surfaces, days and dates; at for points and clock times.
The ball is in the box.
The ball is inside the box, so: in.
Forms
in → in the box · in May— inside something; months and yearson → on the table · on Monday— on a surface; days and datesat → at the door · at five o'clock— a point; clock times
A common mistake
Wrong: I play football in Monday.
Right: I play football on Monday.
Monday is a day of the week, so: on. We say: I play football on Monday.
More examples
We wait at the bus stop.
The bus stop is a point: at.
My birthday is in June.
June is a month: in.