"Noun Clause"

Noun Clause

Noun clause is a dependent clause that functions as a noun (that is, as a subject,object, or complement) within a sentence. 

Noun clause which begin whith that

Noun Clause as a subject :

Tangkuban Perahu is mountain

It is a legend

That Tangkuban Perahu is mountain is a legend

Noun Clause as an object :

Yusi is rude

I think Yusi is rude

Noun Clause which begin whith whether or if 

Noun Clause as an object:

Do you remember Anggi is your Ex-Girlfriend?

I don't remember if Anggi is my Ex-Girlfriend

Noun Clause as a subject :

The beautiful girl is my girlfriend

Whether the beautiful girl is my girlfriend

Noun Clause which begin with a question word

Noun Clause as an Object :

Where doggy go?

Please tell me where doggy go

Noun Clause as a Subject :

What he will does tonight is not important.

Problem 

• When we can use noun clause begin with a question word as a subject?