填空题

A s______ is a structurally independent unit that usually comprises a number of words to form a complete statement, question or command.

【参考答案】

sentence
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The subject in a sentence is the r______ expression which refers to some entity, such as a person, a place, a thing, an idea, or an event. It may be a noun or a noun phrase.
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For any natural language, a set of s______ rules are capable of yielding an endless number of sentences in that language.
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