自考《英语语法》复习指导：十 名词性从句
主语从句 在复合句中做主语，相当于名词，一般置谓语之前，也可用it作形式主语，主语从句放主句之后 that, whether, if, as if, as though, who, whose, which, how, when, where, why, what, whatever, whoever, wherever whether he will come or not doesn’t matter much.
whoever comes here will be welcome.
表语从句 在复合句中做表语，相当于名词，位于系动词之后 it looks as if it is going to snow.
宾语从句 在复合句中做宾语，相当于名词 he asked me which team could win the game.
同位语从句 放在名词之后(news, problem, idea, suggestion, advice, thought, hope, fact等) 表明其具体内容 you have no idea how worried we are.
the fact that he lied again greatly surprised us.