on, on to, onto
The preposition on expresses the location of a person or an object relative to another.
- Henriette sat calmly on the waiting-room sofa.
- The travel budget should be on the agenda for the February meeting.
Onto expresses movement.
- As soon as Allan left the room, the kitten jumped onto the table.
The words on and to remain separate if a change of position does not occur, especially with phrasal verbs such as catch on and go on.
- Has the dog caught on to your trick yet?
- It is time to go on to the next stage of the project.
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