What does a preposition do?

A preposition shows the relationship of a noun (or pronoun) to another word in a sentence. This relationship can indicate time, place, direction, or manner. For example, in the phrase "The book is on the table," the preposition "on" shows the relationship between "book" and "table," helping to clarify where the book is located. Prepositions are essential in providing context and details that enhance the meaning of sentences.

The other options do not accurately describe the function of a preposition. Joining independent clauses is a function performed by conjunctions, while introducing dependent clauses is also the role of specific conjunctions or subordinating conjunctions. Modifying verbs or adjectives pertains to the role of adverbs and adjectives, not prepositions.