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What is the function of a sentence in grammar?

  1. To serve as a fragment of thought

  2. To serve as a unit of expression

  3. To break down complex ideas

  4. To provide a detailed explanation

The correct answer is: To serve as a unit of expression

The correct response highlights that the primary function of a sentence in grammar is to serve as a unit of expression. A sentence is fundamentally designed to convey a complete thought or idea, using a subject and a predicate. This allows for clear communication and understanding between individuals. While other choices mention aspects related to language and communication, they do not encapsulate the full role of a sentence. For instance, a fragment of thought does not constitute a complete or standalone idea, breaking down complex ideas may be part of a sentence's use but does not define it, and providing a detailed explanation usually requires more than one sentence or additional context. Thus, viewing a sentence as a fundamental unit of expression emphasizes its essential purpose in structuring and conveying coherent messages.