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表语从句是英语语法中的一个重要概念。它是指在句子中作为表语的从句，通常由一个引导词引导。那么，表语从句有哪些常见的引导词呢？
1. that
"that"是最常见的表语从句引导词。它可以引导很多种类型的表语从句，比如：
- It is important that we arrive on time. (重要的是我们准时到达。)
- The fact that he failed the exam surprised us. (他考试不及格的事实让我们感到惊讶。)
- My hope is that we can work together again in the future. (我希望我们将来还能一起工作。)
2. whether
"whether"也是常见的表语从句引导词，用于引导表示两个或多个选择中的一个的表语从句。例如：
- I'm not sure whether I should go to the party or stay home. (我不确定是去参加派对还是待在家里。)
- The teacher asked whether we had finished our homework. (老师问我们是否完成了作业。)
3. who/whom
"who"或"whom"可以引导表语从句，用于描述人或人群。例如：
- The winner will be whoever finishes the race first. (谁先跑完比赛谁就是胜利者。)
- I don't know whom she is talking to on the phone. (我不知道她正在电话里和谁说话。)
4. what
"what"可以引导表语从句，用于描述事物或情况。例如：
- The problem is what we should do next. (问题是我们接下来该怎么做。)
- His success is due to what he learned from his failures. (他的成功归功于他从失败中学到的东西。)
以上是表语从句常见的引导词，掌握它们可以帮助我们更好地理解和运用英语语法。
