What is the role of a conjunction in a sentence?

The role of a conjunction in a sentence is to connect words, phrases, or clauses, allowing for the smooth flow of ideas and enhancing the overall coherence of the sentence. Conjunctions can link two or more items of the same kind, such as connecting nouns ("cats and dogs"), verbs ("run and jump"), or complete clauses ("I want to go outside, but it is raining"). By doing this, conjunctions help to form complex ideas and relationships between different parts of a sentence, making them essential for effective communication.

In contrast, the other options represent different parts of speech or functions. Modifying a noun pertains to adjectives, expressing an idea is more aligned with verbs or nouns, and indicating a place is a function of prepositions. These distinctions highlight the unique role that conjunctions play in sentence construction.