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What do conjunctions primarily do in a sentence?

  1. Add an -er form

  2. Connect words or phrases

  3. Establish noun definiteness

  4. Indicate direction

The correct answer is: Connect words or phrases

Conjunctions play a crucial role in sentence structure by connecting words, phrases, or clauses. They help to create relationships between different elements within a sentence, which can enhance clarity and coherence. For example, conjunctions like "and," "but," and "or" allow for the combination of ideas, making it possible to express more complex thoughts. This function of conjunctions is essential in writing and speaking as it helps to establish connections and flow in communication. The other options describe different grammatical functions that do not pertain to conjunctions. For instance, adding an "-er" form relates to the formation of comparatives, establishing noun definiteness pertains to articles and determiners, and indicating direction relates more to prepositions or adverbs. These functions are separate from what conjunctions accomplish in a sentence.