Here's why:
* Conjunctions connect words, phrases, or clauses. They show relationships between the connected elements.
* Prepositions show the relationship between a noun or pronoun and another word in the sentence. They often describe location, time, or direction.
Examples:
* Conjunction: "I want to eat pizza or pasta." ("Or" connects the two food choices.)
* Preposition: "The cat sat on the table." ("On" shows the relationship between the cat and the table.)
Let me know if you have any other grammar questions!