Preposition On

On is used for position on a surface.

On can mean attached to.

On is also used to talk about position on a line (for example a road or a river).

We use on to talk about travel using buses, planes and trains, as well as motor cycles and horses.

We use on for the number of the floor.

On: time

We use on with days.

We use on to talk about one day of the holiday.