This is the third period of this unit.In this period£¬students are planned to go over the attributive clause£¬including the differences between the Restrictive Attributive Clause and the Non-restrictive Attributive Clause£¬the use of the relative pronouns and relative adverbs and the differences between “that” and “which”.In the period of high school£¬the attributive clause is not only difficult but also important£¬so it is necessary to grasp the usage of the attributive clause.