How to make a noun clause sentence?


Here’s a specific exercise from the assignment:
Rewrite the sentences by changing the underlined part into a noun clause:
1-The reason for her absence is unknown.
2-His success depends on his hard work.
3-The truth is that she was late.
Could you please suggest a way to explain this better?

Good day
Thank you for your query. I hope the below can assist you
Transforming your provided sentences into Noun Clauses:
* Original: The reason for her absence is unknown.
* Noun Clause: Why she was absent is unknown.
* Original: His success depends on his hard work.
* Noun Clause: His success depends on how hard he works.
* Original: The truth is that she was late.
* Noun Clause: The truth is that she was late. (This sentence already contains a noun clause, but I'll explain why below).
Explanation of Noun Clauses:
* Definition:
* A noun clause is a dependent clause that functions as a noun in a sentence. This means it can take the place of a noun and act as a subject, object, or complement.
* Key Characteristics:
* Dependent Clause: It cannot stand alone as a complete sentence.
* Noun Function: It performs the same grammatical functions as a noun.
* Introduced by: Often introduced by words like:
* that
* whether
* if
* who
* whom
* whose
* what
* which
* why
* when
* where
* how
Breaking Down the Examples:
* "Why she was absent"
* This clause acts as the subject of the verb "is." It's the "thing" that is unknown.
* "how hard he works"
* This clause acts as the object of the preposition "on." It's the "thing" that his success depends on.
* "that she was late"
* This clause is acting as a predicate nominative, or complement. It renames the subject "truth". The word "that" begins the noun clause.
I hope that clears things up and assists with your question!