回答如下:
下面通过例句来解释:
The man who is standing there is my uncle.
先行词man在定语从句中作主语,关系代词who指代man。
The museum which we visited yesterday is very large.
先行词museum在定语从句中作及物动词visited 的宾语, 关系代词which指代museum。
The hospital where he works is far from here.
本句中的works是不及物动词,不能有宾语。关系副词where 在定语从句中作地点状语, 相当于in which, which指代hospital,故先行词hospital在定语从句中作介词in的宾语。
They will never forget the day when joined the Party.
本句中的joined是不及物动词,不能有宾语。关系副词when在定语从句中作时间状语,when相当于on which, 关系代词which指代day,作介词on the 宾语。
I will never forget the days which we spent in Beijing.
本句中的spent是及物动词,需要有宾语。关系代词which指代先行词days,在定语从句中作spent的宾语。