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What does a conjunction do?

  1. Joins words or groups of words

  2. Describes quantities

  3. Indicates locations

  4. Modifies verbs

The correct answer is: Joins words or groups of words

A conjunction is a part of speech that serves the purpose of joining words or groups of words together. This can include connecting two nouns, such as "apple and orange," linking phrases like "I wanted to go for a walk, but it started to rain," or even joining entire clauses, as seen in sentences like "She sings beautifully and plays the piano." By facilitating these connections, conjunctions play a crucial role in the construction of sentences, allowing for more complex and nuanced expressions. The other options address functions associated with different parts of speech. Describing quantities aligns with adjectives or determiners, indicating locations typically involves prepositions, and modifying verbs falls under adverbs or certain types of adjectives. However, these do not share the fundamental joining function that defines a conjunction.