(1) master the usage of non-restrictive attributive clause. (2) practice about all kinds of attributive clause. teaching important and difficult points: (1) non-restrictive attributive clause. (2) the usage of “which” and “as” in non-attributive clause. teaching methods: the observing---study---concluding method, individual and pair work teaching procedure: step 1. lead-in and revision. 1. the person _______ is standing there is my teacher. 2. the person ________ you spoke just now is my teacher. 3. this is the little girl ___________ parents were killed in the earthquake. step 2 non-restrictive attributive clauses