A noun clause can be used as a direct object or subject?

You are absolutely correct! Noun clauses can indeed function as both direct objects and subjects in a sentence.

Here's a breakdown:

Noun Clause as a Direct Object:

* Direct object: The direct object receives the action of the verb.

* Example: "I know what you did." (The noun clause "what you did" is the direct object of the verb "know".)

Noun Clause as a Subject:

* Subject: The subject performs the action of the verb.

* Example: Whoever wins the race will receive a trophy. (The noun clause "Whoever wins the race" is the subject of the verb "will receive".)

Let me know if you'd like more examples or have any other questions!