Noun clause

A noun clause is a dependent clause and cannot stand alone as a sentence.  It must be connected to an independent clause, a main clause. A noun clause has its own subject and verb. It can begin with a question word. It can begin with if or whether. And it can begin with that.  a) Noun clauses with question words: The following question words can be used to introduce a noun clause: when, where, why, how, who, whom, what, which, whose.   b) Noun clauses, which begin with if or whether: When a yes/no question is changed to a noun clause, if is usually used to introduce the clause.   Example: --> Is Maria at home?                I don't know if Maria is at home. --> Does this bus go to Los Angeles?                I don't know if this bus goes to Los Angeles. --> Did Juan go to Mexico?                I wonder if Juan went to Mexico.     c) Noun clauses which begin with that:  A noun clause can be introduced by the word 'that'. --> I think that Ms. Weiss is a good teacher. In the sentence above, 'Ms. Weiss is a good teacher' is a noun clause. It is the object of the verb 'think'. That clauses are frequently used as the object of verbs which express mental activity. Here are some common verbs followed by 'that clauses'.  Assume that   believe that  discover that dream that Guess that    hear that     hope that     know that Learn that    notice that   predict that  prove that    Realize that  suppose that  suspect that  think that There are many more verbs that can be followed by "that" clause. sumber : http://www.testyourenglish.net/english-online/subjects/nouncl1.html