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名词性从句是指在一个句子中充当名词的句子，它可以作主语、宾语、表语或者同位语。而引导名词性从句的词叫做“名词性从句引导词”，根据引导词的不同，名词性从句又可以分为以下几种：
1. 引导主语从句的引导词
主语从句是指作为整个句子的主语的从句，它通常由一些特定的词来引导。这些引导主语从句的词包括：
- Whether
- That
- If
- Who
- What
- Which
例如：
- Whether you like it or not is none of my business.
- That he is an excellent student is beyond doubt.
- If it rains tomorrow, I won't go out.
- Who will be the next president is still uncertain.
- What he said just now surprised me.
- Which one you prefer is entirely up to you.
2. 引导宾语从句的引导词
宾语从句是指作为整个句子的宾语的从句，它通常由一些特定的词来引导。这些引导宾语从句的词包括：
- That
- Whether
- If
- Who
- Whom
- What
- Which
例如：
- I believe that he is telling the truth.
- I don't know whether he will come or not.
- He asked if I could help him.
- She wonders who will be the winner.
- She doesn't know whom she should ask for help.
- I don't understand what you mean.
- Tell me which book you want to read.
3. 引导表语从句的引导词
表语从句是指作为整个句子的表语的从句，它通常由一些特定的词来引导。这些引导表语从句的词包括：
- That
- Whether
- Who
- Whom
- What
- Which
例如：
- The fact that he is a doctor surprises me.
- I am not sure whether the movie is worth watching.
- The question is who will take care of the baby.
- The problem is whom we should ask for help.
- The point is what we can do to solve the problem.
- The question is which way we should take.
4. 引导同位语从句的引导词
同位语从句是指作为整个句子的同位语的从句，它通常由一些特定的词来引导。这些引导同位语从句的词包括：
- That
- Whether
- Who
- Whom
- What
- Which
例如：
- The news that he got the first prize is exciting.
- The question whether he will come or not is still unanswered.
- The fact who will be the next president is still uncertain.
- The doubt whom we should ask for help is bothering me.
- The problem what we can do to solve the problem is challenging.
- The question which way we should take is still being discussed.
以上就是名词性从句引导词的分类，希望对大家有所帮助！
