There are a number of preposition words that change the meaning of a phrase when used with a particular word. For example, you can use Happen with different prepositions, and you will get a different meaning every time. You can see the examples below:
1. Happen to
Happen to (person)
Example: Please tell me what happened to you in New Delhi.
2. Happen at
Happen at (place)
Example: The event will happen at Connaught Place.
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3. Happen on
Happen on means to come across
Example: While returning from office I happened on a gang of thieves.