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在英语语法中，名词性从句是一种用来作为一个名词的句子。它可以作为主语、宾语或表语。名词性从句可以由不同的连接词引导，如what、who、when、where、why、how等。在本文中，我们将重点讨论引导名词性从句的连接词。
1. That
That是引导名词性从句最常用的连接词之一。它可以作为主语、宾语或表语。例如：
- 主语：That he cheated on the exam is a fact.
- 宾语：She knows that he cheated on the exam.
- 表语：The fact that he cheated on the exam is well-known.
2. Whether
Whether用于引导名词性从句，表示两个可能的选择或情况。它通常用于作为主语或宾语。例如：
- 主语：Whether he will come to the party is still uncertain.
- 宾语：She asked whether he would come to the party or not.
3. Who/Whom
Who/Whom用于引导名词性从句，表示人或人群。它可以作为主语、宾语或表语。例如：
- 主语：Who will be the next president is still unknown.
- 宾语：I don't know whom he is calling.
- 表语：The person who/whom you are looking for is not here.
4. What
What用于引导名词性从句，表示事物、情况或抽象概念。它可以作为主语、宾语或表语。例如：
- 主语：What he said is true.
- 宾语：She doesn't know what he is thinking.
- 表语：The problem is what we need to solve.
5. Where
Where用于引导名词性从句，表示地点或位置。它通常用于作为表语。例如：
- 表语：The place where we met is now a coffee shop.
以上是引导名词性从句的主要连接词。掌握它们的用法，可以帮助我们更好地理解和运用英语语法。希望本文对您有所帮助！
