As you know that there are two kinds of clauses, they are:

1. Main Clause
2. Sub Clause

Sub clause can not stand alone or be a full sentence (Simple Sentence). Main clause is a full sentence and can stand alone without sub clause. On the other hand, sub clause is dependent and main clause is independent. However, sub clause is not parasite (laughing ..... ).

In the previous discussions, I have already discussed that sub clause is needed to give more information to the subject or object of a verb in main clause. Read More ...... .



For examples:

His book is expensive.

The subject in the sentence above is /his book/. But when there are many kinds of books near him, we don't know which book is expensive. But when we say, like :

What he is reading now is expensive.

In the sentence above we finally know about which book is expensive. It means that the expensive book is not on the shelf or on the table, but in his hands now /what he is reading now/.

So, Noun clause is a sub clause which is functioned as a noun and give more information about.

Study the sentences above carefully!