在学习英语的过程中，掌握各种从句的用法是非常重要的。主语从句作为一种常见的从句类型，常常出现在句子中充当主语的角色。为了帮助大家更好地理解和运用主语从句，这里整理了20个典型的例句，并特别针对移动端用户进行了优化展示。

以下是精心挑选的主语从句例句：

1. What she said at the meeting is very important.

2. That he will come tomorrow is certain.

3. Whether it will rain remains unknown.

4. Whoever breaks the law should be punished.

5. Whatever you do, I will support you.

6. Who will go there is still a mystery.

7. How he did it is beyond my comprehension.

8. Where we will have the party has not been decided yet.

9. Why they left so early is unclear.

10. Which book to read first is your choice.

11. When we will start is not clear.

12. What caused the accident remains a question.

13. Whose idea this is has not been revealed.

14. If it snows tomorrow is hard to predict.

15. How much money we need is difficult to calculate.

16. What time it is now can be checked on your phone.

17. Why he was late yesterday is what we want to know.

18. Which team will win the match is being discussed.

19. Where we should meet is already agreed upon.

20. Whether we can finish on time depends on the weather.

这些例句涵盖了主语从句的不同形式和应用场景，包括陈述句、疑问句以及条件句等。通过反复练习这些例句，可以帮助你更自然地使用主语从句进行表达。

对于使用手机或平板电脑学习的朋友来说，将这些例句保存到笔记应用中是一个不错的选择。这样可以在通勤途中随时复习，提高记忆效率。同时，尝试用自己的话改写这些句子，或者结合实际生活场景造句，也是巩固语法知识的有效方法。

希望这20个主语从句例句能为你的英语学习带来帮助！如果觉得有用，不妨分享给更多需要的朋友哦。