"On" Natural Recordings by Native Speakers
The word "on" is a preposition that can have several meanings depending on the context. Some common meanings of "on" include:
In a state of being turned on or activated, for example "The light is on."
In a position of being placed on something, for example "The book is on the table."
In a time frame, for example "The meeting is on tomorrow."
In a state of being going on or happening, for example "The concert is on now."
In a particular location or place, for example "I'm on vacation."
It can also be used in idiomatic expressions such as "on again" meaning "in a relationship again", "on the same page" meaning "in agreement", or "on the ball" meaning "well-prepared".