Adjective Clauses "The woman who is dressed in red is my mother"
Adjective Phrases "The woman dressed in red is my mother."
Restrictive /Nonrestrictive Relative Clauses "My brother who is 10 years old starts working today." (restrictive) "My brother, who is 10 years old, starts working today." (nonrestrictive)
Grammar Notes
Adjective clauses are also called relative clauses. They come after nouns and modify them.
They tell the listener or reader more about the person or thing that the noun refer to.
If the subject relative pronoun is followed by the verb be in any tense, both the relative pronoun and the verb be can be omitted.
A restrictive adjective clause gives information that helps to uniquely identify the noun that it describes.
A Nonrestrictive adjective clause, on the other hand, adds extra information about the noun it modifies. This information is not necessary to identify the noun.