Adjective Clause dinamakan juga "Relative Clause" yaitu Clause (anak kalimat) yang digunakan / berfungsi sebagai adjective yang menerangkan keadaan noun atau pronoun.
Untuk lebih jelasnya penjelasa Adjective Clause, perhatikan penjelasa di bawah ini :
Contoh :
* I have read the book (that) you just mentioned.
Main Clause : I have read the book.
Subordinate Clause : (that) you just mentioned.
Anak kalimat menerangkan kata benda the book, disebut dengan Adjective Clause.
* The lesson (that) she is learning is very difficult.
Main clause : The lesson is very difficult.
Subordinate Clause : (that) she is learning.