is mentioned above(正如上面所提到的)等。而which 常被译为"这一点，那"，并且主句和从句常存在逻辑上的因果关系。

　　Tom was always late for school，which made his teacher very angry.

　　汤姆上学总是迟到，这让他的老师很生气。

　　As can be seen from his face，he is quite pleased.

　　从他的表情可以看出来，他非常高兴。

　　2．关系副词引导的非限制性定语从句

　　当先行词指时间或地点时，且在定语从句中作状语时，用when，where引导非限制性定语从句，why不引导非限制性定语从句，但可用for which代替。

　　We will put off the picnic in the park until next week，when the weather may be better.

　　我们将把在公园的野餐推迟到下周，届时天气可能会更好。

　　Opposite is St Paul's Church，where you can hear some lovely music.

　　对面是圣保罗大教堂，在那里你可以听到一些美妙的音乐。

　　3．"名词/代词＋介词＋关系代词(which/whom)" 结构

　　此类结构常见的有some/several/a few/a little/many/more/most/the largest...of which/whom等形式。

　　Scientists have advanced many theories about why human beings cry tears，none of which has been proved.

　　就人类为什么哭出眼泪科学家提出了许多理论，但没有一项理论得到过证明。

　　Many young people，most of whom were well­educated，headed for remote regions to chase their dreams.

　　很多年轻人都去了偏远地区追求自己的梦想，他们中大部分都受过良好的教育。

　　[即时演练1]　单句语法填空

　　①John invited about 40 people to his wedding，most of whom are family members.

②My friend，who has served on the International Olympic Committee all his life，is retiring next month.