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 Impatient with different prepositions, and you will get a different meaning every time. You can see the examples below:
1. Impatient at
Impatient at(Unexpected things)
Example: He became impatient at Unexpected delay.
2. Impatient for
Impatient for (expected thing)
Example:She is impatient for the arrival of her husband.