On
Adverb, Preposition
UK
/É’n/
US
/É‘n/
Definition
(prep) : Used to show position, time, or activity.
(adv) : Used to describe the state in which a device is operating.
(adv) : Used to describe the state in which a device is operating.
Example
"(prep) : The book is on the table."
"(prep) : She worked on the project all night to finish it before the important deadline."
"(adv) : Please leave the light on so everyone can see clearly while moving around the room."
Explanation
On is a small but very common word used to show position, time, or activity. It can mean something is touching or supported by a surface, like a book on a table. It is also used for time, such as on Monday, or for activities, like working on a project. “On” can also describe the working state of a device, meaning how it is functioning, such as when a light is switched on. Because it has many uses, “on” appears often in daily speech.