定语从句 句中的关系代词分别作什么成分?

问题描述:

定语从句 句中的关系代词分别作什么成分?
①.Is it something (that) people believe?
②.In a trial,a judge must decide (which) eyewitness to believe and which not to believe?
就这两句啊.

第一句:宾语
第二句:定语