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A clause is a syntactic construction containing a subject and predicate and forming part of a sentence or constituting a whole simple sentence. There are two types, independent and dependent clauses. An independent clause can act as a compete thought and can stand alone as a sentence. A dependent clause cannot stand alone and is not a complete thought, meaning it cannot be a sentence. A restrictive clause (also called a "defining/essential clause") is a part of a sentence that limits the meaning of the noun it modifies.
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