1、本篇经验继续介绍that引导的主语从句，并尝试对句子进行了改写。本次我们再举几个示例：It is obvious that the idea doesn't work.
2、有些时候我们还会遇到使用whether引导的主语从句嘛术铹砾whether是单纯连词，不作任何成分，只起到链接作用，表“是否”的意思。比如：Whether the work can be completed on time is doubtful.
3、wh—类连接词引导的主语从句主要包括：连接代词：who、whom、whose 、what连接副词：when\where\how\why等例句：What he said in the lecture was very visionary.
4、也可以用作形式主语例句：It makes no difference where we live.
