What words do noun clauses start with?

Noun clauses don't start with specific words. Instead, they are introduced by subordinating conjunctions that signal the clause's function as a noun.

Here are some common subordinating conjunctions used to introduce noun clauses:

* That: *I know that she is coming.*

* Whether: *He didn't know whether to stay or go.*

* If: *They wondered if it would rain.*

* Who: *Tell me who is responsible.*

* Whom: *He didn't know whom to call.*

* What: *I'm not sure what to do.*

* Whose: *I can't remember whose book this is.*

* Why: *He explained why he was late.*

* How: *Do you know how to get there?*

* Where: *Tell me where you're going.*

* When: *I don't remember when it happened.*

Key Point: Noun clauses act as nouns within a sentence. They can be the subject, object, or complement of a verb, adjective, or adverb.