何时定语从句that不能替代who,which,whom.whose

何时定语从句that不能替代who,which,whom.whose
越简明越好

1.限制性定语从句.就是前面有个,
for example:
The building,which was built in 1880 ,is the highest one in our school.
2.有介词
for example:
The students,most of which are under 18,are threntened by the addiction of the Internet.
3.who做连接词时,先行词为不定代词,如the one,somebody

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