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 Authority with different prepositions, and you will get a different meaning every time. You can see the examples below:
1. Authority for
Authority for (action)
Example: You have no authority for instructing me as such.
2. Authority on
Authority on (subject)
Example: She is indeed an unquestionable authority on Physics.
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3. Authority over
Authority over (person)
Example: He has no authority over me officially.

