怎样判断定语从句的先行词是人还是物?是宾语还是主语?

定语从句的先行词是人还是物：
首先你要清楚先行词是由名词或代词充当,定语从句中不能缺少先行词.然后,你要知道定语从句修饰那个词,所修饰的词就是先行词.断定好先行词就可以知道上是指人还是指物了.
This is the best story that I have read.只是我读过的最好的书.这里先行词是book,指物
The man who my teacher is talking with over there is my friend's father.我的老师在那边谈话的那个男的是我朋友的父亲.这里先行词是 the man,指人
是宾语还是主语：
1.要看定语从句中的动词缺少主语还是宾语
Those who want to sign up for the meeting,please come to Room 306.此句中先行词是those,关系代词为who,动词want前面只有who 来做主语,因此those就是在句中作主语.
2.如果有了主语,则要看动词后是否缺少宾语
The shoes that my mother bought for me last year was broken.此句中shoes 为先行词,关系代词that只能做bought的宾语,因为动词bought 前面有主语my mother
3.如果有了主语,动词后也有了宾语,则看介词,可能作介词的宾语.
The student who our teacher often takes care of is an orphan.此句中student 为先行词,定语从句中的主语是our teacher,care of 是含有介词的动词短语,因此先行词就是做介词的宾语.
孩子,也不知道你到底明白了没有.
再问： 明白了