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.
* Examples:
* "The book of poems." ("Of" shows the relationship between "book" and "poems")
* "I went to the store." ("To" shows the direction of movement)
* "She arrived in the morning." ("In" shows the time of arrival)
Let me know if you have any other questions!