* Conjunctions connect words, phrases, or clauses. Examples include *and*, *but*, *or*, *because*, *since*, *although*.
* Prepositions show the relationship between a noun or pronoun and another word in the sentence. Examples include *on*, *in*, *at*, *to*, *from*, *with*, *by*, *about*.
While some words can act as both conjunctions and prepositions, they do so in different contexts. For example:
* "After" as a preposition: *He arrived after dinner.*
* "After" as a conjunction: *We ate, after which we went to the movies.*
Similarly, "before," "since," and "until" can be both conjunctions and prepositions.
It's important to remember that each word has a specific role in the sentence, and using them correctly is key to clear communication.