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, how, why 等。引導詞有連詞 that (that 不可省 ), whether;代詞有 who, what,which;副詞 when, where, how, why 等。 Unit 2 Language Grammar and Usage Noun clauses introduced by question words amp。 Preparatory subject it Teaching Aims: ? To learn all noun clauses and help students judge different noun clauses ? To learn question words in noun clause. ? To learn how to use it as an empty subject. Tea