定语从句讲解层层进阶三之非限制性定语从句
学习目标:1 了解什么是非限制性定语从句能够与并列句区分开来
2. 掌握非限制性定语从句中关系词的使用尤其是which whom as的用法
Task 1 什么是非限制性定语从句
判断下列几组定语从句，判断哪些是非限制性定语从句，哪些是限制性定语从句。
A : Teachers who are kind are popular with the students.
B: Mr. Wang, who is kind, is popular with the students.
A: he has a son who is a doctor
B: he has a son, who is a doctor
归纳：非限制性定语从句的特点是会被一个_________________隔开。
Task2 非限制性定语从句与并列句的区别
判断下面句子当中，应当填什么？
•He has two sons. Both of_____ are teachers. （句）
•He has two sons, and both of ______are teachers. （句）
•He has two sons, both of _______are teachers. （句）
•He failed his English text, ___________made him very upset（句）
•He failed his English text, and ______________made him very upset. （句）
归纳：句号隔开的是两个简单句，逗号+并列连词如and ,or ,but等隔开的也是简单句，句子缺主语或宾语应当填____________代词如it he 等。
只是被逗号隔开无连词连接的情况下，其中有一个是定语从句，缺主语或宾语应当填_____________代词
•
Task 3: 非限制性定语从句中关系词的使用。
仍然是采用判断先行词在定语从句中充当什么成分来做题。
但值得注意的是：
1.不可用that. 解释：如果先行词在定语从句中做主语或宾语，指人的主格只能用who, 宾
格只能用whom，指物的只能用which., 所属关系仍然是whose. 所有关系词都不能省略。
活学活用
1. The famous basketball star, _____ is an American, came to China yesterday.
2. In those days, she used to go to Mr. Black, with ______ she had a wonderful time.
3. I bought a car yesterday, ______ cost me a lot.
4. Xi’an, ______ I visited last year, is a nice old city.
5. The manager’s daughter, _______ name is Ann, gave me a patient smile
2. 当先行词在定语从句中做状语，做时间状语就用when = 相应介词+ which
做地点状语就用where = 相应介词+ which，做原因状语就用for which（不可用why）
6 He will come to see me next July, _______ he won’t be so busy.
7. The school, _______ I once studied, was built thirty years ago. 8 he has been very interested in plants and earth since his childhood, __________ he determined to choose geography as his major(专业) in college
3. which 和as 还可以用来指代整个句子。
which在逗号之后，指代上文；as 可以放在句首，句中，更灵活。
此外as 还可以有一些固定的搭配。
_____ we know, smoking is harmful to one's health.
The sun heats the earth, ______ is very important to us.
补充：as 引导非限制性从句，常意为“正如”。
可出现在句首、句中、句末。
常见结构有•as is known to all
•as is often the case
•as might / could be expected
•as has been said before
•as has been mentioned above
•as has been pointed out
•as can be imagined
•as can be seen (from these figures
•关系代词as在定语从句中指代整件事，充当句中的主语或者宾语，它经常和the same, such, as 一起搭配使用，共同构成一个固定词组。
•As we all know, he is a famous scientist.
•As is expected, he is a diligent boy.
•She has the same book as you have
•
附加提高题
•The earth is round. ____ is known to all.
•The earth is round, _________ is known to all.
•____ is known to all, the earth is round.
•____ is known to all that the earth is round.
•____ is known to all is that the earth is round.。