Here's why:
* Prepositions are words that show the relationship between a noun or pronoun and another word in the sentence. They often indicate location, time, direction, or other relationships.
Examples:
* on the table (location)
* before the meeting (time)
* toward the city (direction)
* Pronouns take the place of nouns, they don't directly describe them.
* Adverbs modify verbs, adjectives, or other adverbs, not nouns.
* Conjunctions connect words, phrases, or clauses, but they don't create descriptive phrases about nouns.
Let me know if you have any other questions!