限制和非限制性定语从句限制性定语从句与非限制性定语从句*明显的区别：限制性定语从句，无逗号；非限制性定语从句有逗号。1）限制性定语从句：先行词不明确、不，加上从句后，先行词的范围缩小。例1： He was the boy who borrowed the book last week.2）非限制性定语从句：先行词明确、，加上从句后，先行词的范围不变化。例2： I live in Shanghai, which is a big city.a. 非限制性定语从句先行词为专有名词（如David, Asia）及独一性名词（如father只能有一个），因为专有名词或独一性名词本身就具有特殊性，不必再用定语从句加以限定，所以叫作非限制性定语从句。该关系代词引导的定语从句需要和先行词用逗号隔开。1.I met David, who is my classmate.2.I live in Shanghai, which is a big city.（上海只有一个）3.Here comes my father, who is a teacher. (亲爸爸只有一个)课堂练习1In Canada, where the Inuit people are jealously guarding their hard-won autonomy in the country's newest territory, Nunavut, they believe their best hope of survival in this changing environment lies in combining their ancestral knowledge with the best of modern science. b. 非限制性定语从句还有一类非限制性定语从句：SVO, which/as VsO.在这种结构里，which/as一般指前面整句话或部分句子。这也叫做非限制定语从句，并且这种句式which VsO一般表示总结，和SVO，thus VingO.等很相似，经常用在写作里。注意：SVO，whichVO. 无论是还是指代整句话，which前加了逗号，后面从句里的V一定要三单Vs。SVO whichVO.不加逗号，后面从句里的V加不加s主要取决于先行词的单复数。在写作的时候，如果写到了which一定要思考一下，which指代的是前面一个词还是整句话，再判断要不要加逗号，然后判断which后的谓语动词V要不要三单。课堂练习1The explanation may be that the terrestrial planets were once much larger and richer in these materials but eventually lost them because of these bodies' relative closeness to the Sun, which meant that their temperatures were relatively high.课堂练习2The central state, though often very rich and very populous, was intrinsically fragile since the development of new international trade routes could undermine the monetary base and erode state power, as occurred when European seafarers circumvented Middle Eastern merchants after Vasco da Gama's voyage around Africa in the late fifteenth-century opened up a southern route. 初高中生英语考试长难句怎么学？今天关于限制和非限制性定语从句的部分干货大家get了吗？文章篇幅有限，关于同位语的详细解说下期见哦，后续更多实用《高考/四六级/雅思托福通用长难句解析方法》内容会持续更新，记得常来看看呀！如果想更系统地吃透英语长难句，可别错过蒲公英《托福与雅思精讲精练30天》 ！实体书+配套视频课+专属知识点练习答疑，一站式解决你的备考难题～有需要的小伙伴，联系课程顾问老师就能了解具体信息啦！🎁今日福利🎁英语考试长难句怎么学【托福与雅思精讲精练30天】扫码找小蒲领取~👇👇👇
