语法必看：主语从句的定义和引导词
主语从句的定义：主语从句是指在复合句中充当主语的句子，它是名词的拓展，属于主语的第三个表达层次。所以，主语从句和名词一样通常是出现在谓语动词的前面。
例句1：Whether he will pass the examination is still unknown.
他是否能够通过考试仍然不知道。
例句2：What he said inspired me a lot.
他说的话让我受到了很大的鼓舞。
主语从句的引导词：
主语从句的引导词与宾语从句，表语从句和同位语从句的引导词几乎相同（表语从句有几个特殊引导词除外）请参照本站文章表语从句的用法讲解。以下就按照引导词在主语从句中的意义和功能分别讲解。
that引导主语从句
例句1：That youth is wholly experimental is known to us all。
众所周知，青春就是探索的岁月。
例句2：That she finished reading an English novel surprised us all.
她读完了一部全英文小说让我们大吃一惊。
Whether引导主语从句
例句1：Whether she will come to the party makes no difference.
她来不来参加聚会都没有关系。
例句2：It makes no difference whether/if she will come to the party.
她来不来参加聚会都没有关系。
Who, what, which引导主语从句
例句1：Who will be the leader of the team has not been decided yet.
谁会成为这个队的领头人还没定下来。
例句2：What the kids need is a peaceful growing environment.
孩子们需要的是一个和平的生长环境。
例句3：Which you choose has nothing to do with me.
你选择哪一个跟我没有任何关系。
whose, what, which引导主语从句
例句1：Whose face will flush is the liar.
谁的脸红了谁就是骗子。
例句2：What goal you set now determines what your will gain in the future.
你现在设立什么目标决定了你将来会有什么收获。
例句3：Which bus we should take is the first problem we have to solve now.
我们应该乘坐那辆车是我们现在首先要解决的问题。
when, where, how, why引导主语从句
例句1：Why Tony did this remained a mystery. 为什么托尼做这件事仍然是个谜。
例句2：When we will have our winter holidays is still uncertain.
我们什么时候放寒假还不确定。
例句3：How the accident happened is not clear to anyone.
这场事故是怎么发生的，谁都不清楚。
例句4：Where we shall have our party is not your business.
我们应该在哪开派对跟你没有关系。
Wh-ever连接词引导主语从句
例句1：Whoever has a strong will is likely to become successful.
凡是有坚强意志的人都有可能成功。
例句2：Whatever is worth doing at all is wroth doing well.
凡是值得做的事情就值得做好。
例句3：whosever book is overdue will be fined.
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