Grade 7 Grammar Lesson 11 The phrase and the clause
Just like the phrase, the clause is also a group of words that means something. The basic difference between a phrase and a clause is that a clause contains a finite verb. In other words, the clause could be a sentence in itself.
A clause that acts as a noun in a sentence is called a noun clause.
A noun clause is usually introduced by if, whether, that or wh- words.