Which of the following statements is not correct with reference to English grammar?
1
An appositive is a noun or a pronoun that is placed next to another noun or pronoun to identify it or give more information about it.
2
A verbal is a verb form that functions in a sentence as a noun, an adjective, or an adverb.
3
A clause is a group of words without a subject-verb unit.
4
A Subordinate clause cannot stand without the help of a Principal clause