1. which 非限制性定语从句的使用
We should live in harmony with nature, which，I think， is beneficial to both humans and nature.
2. as 引导非限制性定语从句的固定结构
As is known to us all, an increasing number of people have become aware of the harm that smoking does to the health.
3. 主语+ is + the +形容词最高级+名词+(that)+主语+ have ever done...
She is the most beautiful girl that I have ever seen in my life.
4. There was a time when… 曾经有一段时间…
There was a time when I hated to speak to her.
5. that 引导的定语从句
We can also look for other resources that serve the same purpose.
6. who 引导的定语从句
Anyone who breaks the law should be punished.
7. where 引导定语从句
We should take an active part in various after-class activities, where we can not only broaden our views but also obtain some social skiils.
经典例句很多。
一种类型是限制性定语从句，它给出的是名词的进一步限定，比如：The book that I borrowed from the library is very interesting.另一种类型是非限制性定语从句，它给出的是对名词的额外描述，用逗号隔开，比如：My teacher, who is always helpful, gave me great advice.这些经典例句都是由一个引导词（如that，which，who）+从句构成，它们帮助我们更精确地表达意思，使语言更加丰富多彩。
