A noun clause...

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is only used as a subject.
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modifies the subject.
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is only used as an object.
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can be used as either the subject or the object of a sentence.
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1 answer

A noun clause can be used as either the subject or the object of a sentence. It functions as a single noun within the sentence and can fulfill various roles, including being the subject of a verb, the object of a verb, or the object of a preposition.