Austin Li is a person who/that is a successful salesman.
物
Austin Li promotes beauty products which/that are in good quality with low proce.
宾语
人
Those girls who/whom/that/X he asks to buy things are crazy.
物
He has a lot of lipsticks which/that/X many girls want to have.
表语
人
He is longer the man that/X he used to be.
物
This is no longer the place that/X it used to be.
定语
人
He is an Internet celebrity whose fans have strong buying power.
物
He and his assistant often have the conversation whose pleasure only they can get.
补语
when 指时间，在从句中时间状语，他的先行词通常有：time、day、morning、night、week、year……
注：当occasion在表示”a particular time or instance of an event（特定的）时刻；场合“时，定语从句引导词用when.
where 指地点，在从句中作地点状语。它的先行词通常有：place、spot、street、house、room、city、town、country……
注：当point、situation、position、case、condition、stage，（阶段）等词作先行词表示”情况，境地、场合“等意思时，用where引导定语从句
The speed at which the car runs depends on the road condition .
复杂介词：by means of , as a result of , in front of , in the back of , all of , most of 等
The instrument by means of which the temperature is measured is called thermometer .
There are forty students in the classroom , all of whom are working hard at a problem in mathematics .
注意不能拆开的动词短语
look after , look for , turn in , pay attention to , take care of , depend on , listen to
The babies ( whom ) the nurses are looking after are very healthy
Is this the book ( which / that ) she was looking for？
子主题
语法意义及特征：对先行词起修饰限制作用,如果去掉,主句意思就不完整明确了。
The accident happened at the time when I left .
非限制性定义从句
有逗号
不能用that和why来引导
系词即使作宾语也不可省略
除了可以修饰单个词,还可以修饰整个句子
His mother , whom he loved deeply , died ten years ago.
He was late again , which made the teacher very unhappy.
语法意义及特征：对先行词的附加说明,与主句的关系不十分密切。
His mother , whom he loved deeply , died ten years ago.
