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. Hear of
Hear of (something)
Example: I heard of his death from Riaz.
2. Hear from
Hear from (person)
Example: I heard the death news from Riaz.
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3. Hear by
Hear by (post)
Example: I hear by this letter about your promotion.