名词性从句的引导词在英语语法中扮演重要角色，可以引导主语从句、宾语从句和表语从句。主要的引导词包括"What"、"Whether"、"If"、"That"、"Whichever"、"Who"、"Whoever"、"Whom"和"Whomever"。这些引导词的使用可以通过各种例句进行理解和学习。
1. 引导主语从句的词汇
引导主语从句的词汇有：
- What
- Whether
- If
- That
- Whichever
- Who
- Whoever
- Whom
- Whomever
例如：
- What he said is true.
- Whether she comes or not doesn't matter.
- If you want to succeed, you have to work hard.
- That he is a liar is obvious.
- Whichever book you choose, it will be ok.
- Who is coming to the party tonight?
- Whoever wins the game will get a prize.
- Whom she loves is none of our business.
- Whomever you invite to the wedding, don't forget to invite me.
2. 引导宾语从句的词汇
引导宾语从句的词汇有：
- That
- Whether
- If
- What
- Whichever
- Who
- Whoever
- Whom
- Whomever
例如：
- I know that he is a good person.
- Do you know whether it will rain tomorrow?
- She asked if I wanted to go shopping with her.
- I don't understand what he is saying.
- You can choose whichever color you like.
- I don't know who is coming to the party tonight.
- Whoever wins the game will get a prize.
- Could you tell me whom she loves?
- I will invite whomever I want to my party.
3. 引导表语从句的词汇
引导表语从句的词汇有：
- That
- Whether
- If
- What
例如：
- The truth is that he is a liar.
- The question is whether we can finish the project on time.
- The problem is if we have enough resources to complete the task.
- The fact is what she said is true.
