定语从句是中考、高考、雅思的”必考语法”，但很多学生只会写 which is... 和 who is... 两种”安全句式”。真正拉开差距的，是限制性定语从句——它负责”精准限定”：告诉读者你说的到底是哪一类人、哪一个地方、哪一件事。
今天我们从FT一篇美国CDC（疾控中心）发布疫苗接种指引的报道出发，学4个可以直接套用的限制性定语从句结构。
📖 FT原文选段
The US Centers for Disease Control and Prevention issued new guidelines on Monday saying that people fully vaccinated against Covid-19 can now meet each other indoors without social distancing or masks.
Until now, CDC guidance has not distinguished between those who have been vaccinated and those who have not, recommending against indoor socialising, travelling and large gatherings for everyone.
Under the new guidelines, those who have been fully vaccinated can visit the houses of other fully-vaccinated people, or houses where there is no one at high risk of the disease.
She added that it would no longer be recommended that vaccinated people get tested and quarantine after coming into contact with someone who has the disease.
中文对照
美国疾病控制和预防中心周一发布新的指引，表示完成新冠疫苗接种的人现在可以在室内见面，不需要保持社交距离或戴口罩。
此前，CDC的指引没有区分已接种和未接种的人，建议所有人都避免室内社交、旅行和大型聚会。
根据新指引，已完成接种的人可以拜访其他已完成接种者的家，或者家中没有高危人群的家庭。
她还补充说，不再建议已接种的人在接触过患病者后进行检测和隔离。
💡 4种限制性定语从句高分结构
1. who 作主语，关系词不可省略
原文:
those who have been vaccinated / someone who has the disease
结构分析：
[those/someone/people] + who + [谓语动词]——当先行词是”人”，且关系代词在从句中作主语时，who 绝对不能省略。这是限制性定语从句和宾语从句关系词最根本的区别。
❌ 学生初版 People are vaccinated can meet indoors.
（典型错误：漏掉 who，两个谓语动词挤在一个句子里——这是中英文差异导致的”双谓语”错误。）
✅ 升级版 People who have been fully vaccinated can meet indoors without masks.
💡 效果
加上 who have been fully vaccinated，读者立刻知道你说的是”哪一类人”——限定性从句的作用就是缩小范围、精确指代。议论文里写”人们""学生""父母”这类泛指名词时，加一个限定性从句立刻提升准确性。
✅ 模板： [泛指名词] + who + [限定条件] + [主句谓语]
2. where 引导地点限定——“哪里的”
原文:
houses where there is no one at high risk of the disease
结构分析：
[地点名词] + where + [完整句子]——当先行词是地点（houses, cities, schools…），且从句需要完整的”主谓”结构时，用 where。注意 where 在从句里作状语，所以从句本身必须主谓齐全。
❌ 学生初版 We should go to places which no one is at risk.
（错误：which 后面直接接了一个完整句子，缺少介词——which 在从句中作宾语或主语，不能作状语。）
✅ 升级版 We should avoid gathering in places where the risk of infection is high.
💡 效果
where + 完整句子 是描写地点时最实用的结构，比 which 少一个介词，逻辑也更清晰。写”学校""城市""社区”等话题时直接用。
✅ 模板： [地点名词] + where + [完整主谓结构]
3. 并列限定 + 省略重复谓语——高级的”对比限定”
原文:
those who have been vaccinated and those who have not
结构分析：
这是这篇报道里最精彩的一处。完整的写法是 those who have been vaccinated and those who have not [been vaccinated]——第二个分句省略了重复的谓语 been vaccinated，只留 have not。这种”前详后略”的处理，让对比更紧凑、更有节奏感。
❌ 学生初版 Some people are vaccinated. Some people are not vaccinated.
✅ 升级版 The policy distinguishes between those who have been vaccinated and those who have not.
💡 效果 “已接种的人 vs 未接种的人”这种对举，用一个定语从句+省略谓语就完成了。这个结构适用于一切”两类人对比”的议论文：支持者与反对者、城市与乡村、线上与线下。
✅ 模板： those who [动作] and those who [助动词否定形式]
4. 过去分词后置定语——限制性定语从句的”简化版”
原文:
people fully vaccinated against Covid-19
结构分析：
people fully vaccinated against Covid-19 其实是 people who have been fully vaccinated against Covid-19 的简化——把 who have been 全部删掉，只保留过去分词短语放在名词后面。这是新闻英语里最高频的压缩技巧，也是雅思写作追求”信息密度”的关键手段。
❌ 学生初版 People who are vaccinated against Covid-19 can meet.
✅ 升级版 People fully vaccinated against Covid-19 can now meet indoors.
💡 效果
去掉 who are 之后句子立刻”瘦身”，信息密度更高。写作时凡是 名词 + who/which are + 过去分词 的结构，都可以尝试简化成 名词 + 过去分词短语——这是从”口语化”到”书面化”的分水岭。
✅ 模板： [名词] + [过去分词短语] + [主句]
📝 写作建议
按”从易到难”的顺序练习这4个结构：
- 先掌握 who 作主语的限定性从句（第1个）——先保证不丢”双谓语”这种基础分
- 再练习 where 地点限定（第2个）——让”地点描写”不再只会用 there is
- 然后挑战 并列对比省略（第3个）——写”两类人对比”时直接用
- 最后升级 过去分词简化（第4个）——这是从”对”到”好”的关键一跃
一个小提醒：限制性定语从句的判定标准很简单——去掉这个从句，句子的意思就变模糊了。它就是用来”锁定”先行词的，所以不用加逗号。
厦门灯塔 · 专业英语作文逐句批改 | 微信 linstudio799 专注中高考/雅思写作 · 逐句精批 + 逻辑重构 + 母语级升级