Question

Who is knocking at the door punctuate the following

Answer 1

Answer:

Who is knocking at the door?

Explanation:

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Answer 2

Explanation:

No.

In that sentence, if “who” were a relative pronoun, it would be referring to a noun (typically a person previously identified, such as “the policeman who is knocking at the door”).

By itself, “who” is not a clause.

In your sentence, “who” is neither a relative pronoun nor an interrogative clause, but an interrogative pronoun. It signals a question (interrogative) and is a stand-in (pronoun) for the unknown.