很多考生以为同义替换就是 big → large、important → significant 这类近义词对调。剑桥真题告诉你：出题人真正盯上的，远不止形容词。
以 剑 14 Test4 Passage 1 的笔记填空题为例——一篇讲蚂蚁抗衰老研究的 Passage，前四道填空就藏了四组完全不同逻辑的改写。把它们的原文证据句和题目表述并排放在一起看，规律比任何词汇书都清晰。
一个段落，四组改写
剑 14 Test4 Passage 1 的 Q1–Q4 共享同一段原文，出题人用一段笔记表格覆盖了 Giraldo 实验的全部行为指标。下面是每组对应的原文证据句和题目表述：
Q1 题目写 "a total of different age groups"，原文是：
Giraldo focused on ants at four age ranges: 20 to 22 days, 45 to 47 days, 95 to 97 days and 120 to 122 days.
改写点不在单词层面——four 和 four 没有变。真正的改写是结构性的：原文用冒号引出四个具体年龄段，题目用一个概括短语 "a total of four different age groups" 把这些细节打包。数字概括改写，考的是你能否从细节抽身看整体。
Q2 题目写 "how well ants looked after their..."，原文是：
Giraldo watched how well the ants took care of the young of the colony, recording how often each ant attended to, carried and fed them.
这是最经典的一类：短语动词替换。took care of → looked after。两个短语都是初中词汇，但如果你只盯着 colony 或 fed 这样的名词找答案，就会错过 young 这个真正的空格目标——因为题干把宾语结构从 "took care of the young of the colony" 重组成了 "looked after their ____"。
Q3 题目写 "their ability to locate ____ using a scent trail"，原文是：
She compared how well 20-day-old and 95-day-old ants followed the telltale scent that the insects usually leave to mark a trail to food.
改写层级拉大了：原文是一个定语从句堆叠的名词短语 "a trail to food"，题目把它动词化成 "locate ____ using a scent trail"。followed → locate，trail to food → food。你需要在脑中将整个场景重新编码，而不是做单词匹配。
Q4 题目写 "the effect that ____ had on them"，原文是：
She tested how ants responded to light and also measured how active they were...
方向反过来了：原文是动词结构 "responded to light"（蚂蚁对光做出反应），题目翻转成名词结构 "the effect that light had on them"（光对蚂蚁产生的影响）。主语和宾语互换，动词变成名词——但仍指向同一个实验变量。
四道题四类改写：数字概括、短语动词替换、名词↔动词转换、主语宾语翻转。没有一道是简单的近义词对调。
变化动词：出题人手里最频繁被改写的一类词
如果你翻看足够多真题的 paraphrasePairs 数据，会发现一个规律：表示"变化"的动词——decline、abandon、interrupt、advance——是出题人改写频率最高的词类之一。
剑 19 Test4 Passage 1 Q1 是典型。题干写 "Forty years ago, there were fewer butterflies in Britain than at present." 原文证据句只有一句话：
populations of around two thirds of butterfly species have declined in Britain over the past 40 years.
declined 被展开成一个比较结构："there were fewer... than at present"。时间方向也同时改写：past 40 years → Forty years ago。这道题的陷阱在于不少考生把 declined over the past 40 years 错误理解成"40年前更少、后来变多"，正好与原文相反——变化方向词的误读直接导致 FALSE 写成 TRUE。
再看 剑 9 Test3 Passage 2 Q16。这是一道段落信息匹配题，题干要在文章中找到 "a previous attempt by Britain to find an alternative source of energy"。对应的原文是 A 段中的：
Unlike wind power, which Britain originally developed and then abandoned for 20 years allowing the Dutch to make it a major industry...
出题人把 "originally developed and then abandoned for 20 years" 浓缩成两个词：previous attempt。动词短语被抽象名词替代，时间细节全部剥离。这不是词汇量的考查，而是概括能力的考查。
身份标签：从 enthusiast 到 amateur watcher
另一类高频改写目标是表示"人"或"角色"的名词。出题人很少让它们原样出现在题目里。
剑 19 Test4 Passage 1 Q6 是判断题，题干写 "The data used in the study was taken from the work of amateur butterfly watchers." 原文证据句是：
First, the researchers pulled together data from millions of records that had been submitted by butterfly enthusiasts – people who spend their free time observing the activities of different species.
butterfly enthusiasts → amateur butterfly watchers。破折号后面的同位语解释（"people who spend their free time observing..."）才是关键线索——出题人用 amateur 对应 free time，用 watchers 对应 observing。不读破折号后内容，这道 TRUE 题就可能被误判为 NOT GIVEN。
剑 9 Test4 Passage 1 Q5 也是如此。题干写 "Marie took over the teaching position her husband had held." 原文证据句是：
On May 13, 1906, she was appointed to the professorship that had been left vacant on her husband's death, becoming the first woman to teach at the Sorbonne.
professorship → teaching position，appointed to → took over，left vacant on her husband's death → her husband had held。整句话几乎每个实词都被改写，但语义完全保留——这正是雅思阅读同义替换的常态。
从统计到行动
翻遍上述四个 section 的 paraphrasePairs，最高频被改写的词类依次是：变化动词（decline、abandon、interrupt、advance）、身份/角色名词（enthusiast、professor、conservationist）、时间表达（past 40 years → forty years ago，originally → previous），以及短语动词（take care of → look after，respond to → effect on）。
这恰好对应一个练习方向：精读真题时，不要只圈"生词"。拿荧光笔标出每一道题里被改写的动词和身份名词，把它们和原文对应词并排写在笔记本上。十篇 Passage 下来，你会发现自己不再被改写迷惑——因为你已经知道出题人盯上的是哪些词。