noun clause is a clause (containing a subject and a verb) that
can replace a noun.
The examples below show how they are
I don't know her. (not a noun
I don't know who
I don't know where
I don't know when
she moved to the United States.
Noun clauses often use words such
as when, what, why, who and other question words, but the speaker
may or may not be making a question.
You can also begin a sentence with a noun clause:
Why he did that is a mystery.
(It is a mystery)
What she's doing is very interesting.
(That is very interesting.)
A good knowledge of noun clauses
will help your English, but it's important to practice their
Here are some examples of sentences that use
1. Do you
know how old they are?
2. This father is wondering what
his son will do in the future.
3. I can't remember
what time the flight arrives.
Because noun clauses are often used with question words, many students make
I don't know who is that woman. (incorrect!)
I don't know who that woman is. (correct)
He wants to find out where was she born. (incorrect!)
He wants to find out where she was born. (correct)
Remember to put the subject before the verb in a noun clause.
In the next lesson, we'll learn how to use "that" at the beginning of a
Next: Lesson Seven