1. Position or Location: When "on" is used as a preposition to indicate position or location, it suggests that something is physically supported or resting on a surface.
- The book is on the table.
- The picture is hanging on the wall.
2. Contact or Surface: "On" can indicate contact or being in direct connection with a surface or object.
- Write your name on the paper.
- The stain is on your shirt.
3. Time or Date: "On" can be used to specify a particular time or date when an event or action occurs.
- I have a meeting on Monday.
- The concert is on Saturday night.
4. Attachment or Addition: "On" can indicate that something is attached or added to another object or surface.
- Put the stamp on the envelope.
- Stick the post-it note on the document.