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名词性从句是英语语法中的一个重要部分，它通常用作主语、宾语、表语或补语。名词性从句可以分为三种类型：宾语从句、主语从句和表语从句。
宾语从句
宾语从句通常出现在主句的谓语动词后面，作为主句的宾语。宾语从句通常由连词that, if, whether, wh-等引导。
例如：
- I believe [that he is coming].
- She asked [if I could help her].
- He doesn't know [whether he should go].
- Can you tell me [what time it is]?
主语从句
主语从句通常出现在主句的谓语动词前面，作为主句的主语。主语从句通常由连词that, whether, wh-等引导。
例如：
- [That he is coming] is good news.
- [Whether he should go] is still uncertain.
- [What time it is] doesn't matter.
表语从句
表语从句通常用来描述主语，作为主句的表语。表语从句通常由连词that, whether, wh-等引导。
例如：
- The fact [that he is coming] is good news.
- His concern is [whether he should go] or not.
- The question is [what time it is].
以上是名词性从句的三种类型。当我们能够准确运用这些从句时，就能够更加流利地运用英语并且使语言表达更加精准。
