Resposta :
In the sentence "I don't know why most of you failed the exam," the noun clause "why most of you failed the exam" functions as:
- Noun Clause as a Subject: This is incorrect because the noun clause does not act as the subject of the sentence. The subject of the main clause "I don't know" is "I."
- Noun Clause as an Object: This is correct. The noun clause "why most of you failed the exam" serves as the object of the verb "know" in the main clause. It answers the question "what" the speaker doesn't know. The entire clause functions as a direct object in the sentence structure.
Therefore, the correct answer is:
- Noun Clause as an Object.