关于 “It is said that…” 句型的解析
句型结构：
该句型属于被动语态的固定句式，形式为：
It is + 过去分词（如 said, reported, believed 等） + that 从句
- It 为形式主语，that 从句是真正的主语，表示“据说/据报道/据信……”等含义。
- 主动语态可转换为People say/report/believe that…（但被动语态更强调客观性）。
核心用法与特点
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常见过去分词及含义
- It is said that…（据说）
- It is reported that…（据报道）
- It is believed that…（据信）
- It is known that…（众所周知）
- It is estimated that…（据估计）
- It is rumoured that…（据传）。
例句：
- It is said that the new policy will benefit students a lot.（据说新政策将对学生有很大帮助）。
- It is reported that a space station will be built on the moon.（据报道将在月球上建立空间站）。
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时态与逻辑主语的转换
- It is said that… 可转换为Sb./Sth is said to do/be…，需注意时态一致：
- It is said that he is honest. → He is said to be honest.（据说他很诚恳）。
- It is said that he went abroad. → He is said to have gone abroad.（据信他已出国）。
- It is said that… 可转换为Sb./Sth is said to do/be…，需注意时态一致：
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虚拟语气独特情况
当过去分词表示“建议、要求、命令”时（如 suggested, recommended），that 从句需用虚拟语气，即(should) + 动词原形：- It is suggested that students (should) read more books.（建议学生多读书）。
相关扩展句型
下面内容是与该结构相似的常用表达：
- It is thought that…（大众认为）
- It is thought that beans are good for the heart.（大众认为豆类有益心脏）。
- It is expected that…（预计/期望）
- It is expected that the meeting will last four days.（预计会议将持续四天）。
- It is well-known that…（众所周知）
- It is well-known that water is essential to life.（水是生活之源是常识）。
使用注意事项
- 主语转换时的时态调整：若原句为过去时，转换后需用不定式的完成式（to have done）。
- 被动语态的客观性：该句式常用于新闻报道、学术写作等需要客观陈述的语境。
- 避免混淆：类似动词如suggest 的主动形式不可直接用于 Sb. is suggested to do…（需保持被动结构）。
如需更多例句或练习，可参考文档。
