Mary likes music that is quiet and gentle.
玛丽喜欢轻柔的音乐。(that作主语)
The coat (that) I put on the desk is blue.
我放在桌子上的那件外套是蓝色的。(that作宾语)
2)which用于指物,在句中作主语、宾语或表语。作主语不可省略,作宾语可省略
The building which stands near the train station is a supermarket.
位于火车站附近的那座大楼是一家超市。(作主语)
The film (which) we saw last night was wonderful.
我们昨天晚上看的那部电影很好看。(作宾语)
The girl who often helps me with my English is from England.
经常在英语方面帮助我的那个女孩是英国人.(作主语)
Who is the teacher (whom) Li Ming is talking to?
正在与李明谈话的老师是谁?(作宾语)
关系副词的用法
(1)when指时间,其先行词表示时间,when在定语从句中作时间状语。
This was the time when he arrived.
这是他到达的时间。
(2)where指地点,其先行词表示地点,where在定语从句中作地点状语
This is place where he works.
这是他工作的地点。
(3)why 指原因,其先行词是原因,why在定语从句中做原因状语
Nobody knows the reason why he is often late for school.
没人知道他为什么上学总迟到。