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 Warn with different prepositions, and you will get a different meaning every time. You can see the examples below:
1. Warn against
Warn against (an action)
Example: I have already warned you, against your such negligence.
2. Warn of
Warn of (danger)
Example: I have already warned you of the risk involved.
![Preposition Words with Obliged to and at](https://englishperiod.com/wp-content/uploads/2022/04/WhatsApp-Image-2022-04-25-at-3.13.42-PM-2-1024x1024.jpeg)
![](https://englishperiod.com/wp-content/uploads/2022/05/D43228126_IN_OP_Central-back-to-school_Apr22_rush_1500X400-1024x273.jpg)