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宾语从句是英语语法中的一种重要语句结构，用于表达一个句子作为另一个句子的宾语。连接词在宾语从句中扮演着重要的角色。下面将按照不同的语法类别介绍宾语从句连接词。
连接代词
连接代词用于引导宾语从句，并且代替宾语从句中的名词。常见的连接代词有：what, who, whom, which, that。例如：
- I don't know what he wants to do.
- Can you tell me who is coming to the party tonight?
- She doesn't like the dress that you bought for her.
连接副词
连接副词用于引导宾语从句，并且代替宾语从句中的副词。常见的连接副词有：when, where, why, how。例如：
- Do you know when the train will arrive?
- I don't know where I put my keys.
- Could you tell me why you are angry?
连接介词
连接介词用于引导宾语从句，并且在宾语从句中充当介词的宾语。常见的连接介词有：as, after, before, since, until, unless。例如：
- She won't go to bed until she finishes her homework.
- You can't leave unless you finish your work.
连接动词
连接动词用于引导宾语从句，并且在宾语从句中充当谓语动词。常见的连接动词有：if, whether。例如：
- I don't know if he is coming to the party tonight.
- Could you tell me whether you want to go to the concert?
以上是宾语从句连接词的分类及其示例。通过学习这些连接词，我们可以更好地理解宾语从句的语法结构，并且更加灵活地运用英语语法。
