引导词that如果在从句中作成份就是定语从句，不做成分就是同位语从句。如： this is the place that i visited last year. that在从句中作visited的宾语，所以这是定语从句。i'm worried about the fact that he's been lying. 这个that在从句中不作成分，lying不及物，所以这是同位语从句
