that做主语，引导定语从句:
students lack practical knowledge about how to deal with the issues that face most college students.
翻译: 学生缺乏关于如何处理大多数大学生面临的问题的实用知识
错翻: 学生缺乏关于如何处理面对大多数大学生这种问题的实用知识(错翻成同位语)
不缺主语时，that做同位语从句:
I had no idea that you were here.
翻译: 我不知道你在这里。
The story goes that William killed his wife.
翻译: 据说威廉杀死了他的妻子。