Final answer:
Declarative, imperative, and optative sentences serve different functions in language communication.
Explanation:
Declarative sentence makes a statement of fact or asserts something to be true. It does not ask a question or give an order, simply presents information. For example, 'The sun is shining brightly.'
Imperative sentence issues commands or requests. It tells someone to do something. For instance, 'Please pass the salt.'
Optative sentence expresses wishes or desires. It often includes words like 'may' or 'let.' For example, 'May you have a wonderful day.'
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