that与what引导名词性从句的区别that引导名词性从句只起连接作用，在从句中不作任何成分，无意义，在宾语从句通常省略，但在主语从句、表语从句和同位语从句中均不能省略；what除引导从句外，还在从句中作成分，意为“所的(东西)”，在含义上等于“名词+that”。如：1. 用that的例子That she lacks experience is obvious. 她缺少经验，这是显然的。The police learned that he wasnt there at that time. 警察获知他那时不在场。He realized that she too was exhausted. 他意识到她也精疲力尽。My idea is that you shouldnt have left the country. 我的意见是你不应该离开那个国家。Bob has the mistaken idea that tomorrow is a holiday. 鲍勃错误地认为明天是一个假日。It was quite plain that he di
