Subject Clause主语从句:做主语用的名词性从句,因其在复合句中做主语,又称主语从句,引导主语从句的有从属连词that ,whether , 连接代词who ,what ,which , 连接副词when ,where , how , why 等。从属连词:that , whether 等that 引导主语从句只起引导作用,本身无实际意义,在主语从句中不充当任何成分,但不能省略。That he will win is certain.他肯定会赢。Whether hell come here isnt clear. 他是否会来这里还不清楚。 注意: 由that 引导的主语从句有时为了使句子结构平衡, 避免 “头重脚轻”, 常用 it 作形式主语, 而把从句放在后面。 例如: 1). That he will refuse this piece of advice is impossible._ _2).That they should like each other is natural. _*it 为形式主语It is natural that they should lik