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 Speak with different prepositions, and you will get a different meaning every time. You can see the examples below:
1. Speak for
Speak for (Person)
Example: You go there, I have already spoken for you to the seceratary.
2. Speak about
Speak about (thing)
Example: He is speaking about the ‘unemployment’ problem.
