Here's why:
* Prepositions show the relationship between a noun or pronoun and another word in the sentence. They often indicate location, time, or direction.
* Verbs are action words or words that describe a state of being.
Examples:
* "I am at the store." "At" shows the location of "I."
* "He arrived at noon." "At" indicates the time of arrival.
* "Look at the bird." "At" shows the direction of looking.
Let me know if you have any other questions about parts of speech!