非限制性定语从句是对意义已经非常明确的先行词给予补充、说明,删去非限制性定语从句,主句的意思仍是概念清晰、结构完整的。非限制性定语从句的引导词有who, whom, which, whose, as, when, where等, that不可用于引导非限制性定语从句, 从句之前要用逗号。
先行词指人, 则用who, whose, which等;
先行词指物, 要用which;
先行词表时间或者地点, 并在句中作时间状语或者地点状语时要用when或者where引导。
1.关系代词指代整个主句时,使用非限制性定语从句。
👉You did alot for me, for which I was grateful.
你为我做了许多, 对此我很感激。
👉The Diaoyu Island belongs to China, as is known to us.
众所周知, 钓鱼岛属于中国。
👉A middle-aged woman killed her husband, which frightened me very much.
一个中年女子杀害了自己的丈夫,这令我十分恐惧。
2.当先行词指的是世界上独一无二的事物或人名地名等专有名词时,使用非限制性定语从句。
👉China, which is my motherland, is developing fast.
中国是我的祖国, 正在快速发展。
👉Eason, who was a popstar, got married last year.
伊森去年结婚了, 他是明星。
👉Last Sunday they reached Nanjing, where a conference was to beheld.
他们上周日到达南京, 有个会议要在那里举行。
3.当先行词指的是某人只有一个亲属(son, daughter等) 时, 使用非限制性定语从句。
👉He has a daughter, whois studying in London.
他有个女儿, 现在正在伦敦学习。(只有一个女儿)
👉This is my teacher, who has something to tell you.
这是我的老师, 他有一些事情要告诉你。