主语从句语法详解
时间：2026-05-09 06:42:38来源：主语从句是句子中充当主语的从句，通常由连接词引导。常见的引导词包括：that、whether、if、who、what、when、where、why、how等。
| 类型 | 引导词 | 举例 |
| that引导 | that | That he passed the exam surprised everyone. |
| whether/if引导 | whether/if | Whether he will come is unknown. |
| 疑问词引导 | who/what/when/where/why/how | What he said is true. |
主语从句常放在句首，有时也可用形式主语“it”代替，如：It is clear that he is wrong.
主语从句在语法结构上与陈述句相同，需注意时态和语序。掌握主语从句有助于更准确地表达复杂意思。
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