你问的这些问题都是定语从句的核心知识点,需要牢固掌握.
1.定语从句的关系词分为关系代词和关系副词.关系代词其实就是先行词的替身,在从句里作为一个名词性成分.比如 I know the man who is standing there.其中,who这个关系代词就是代替了man这个先行词,在从句里作主语成分；而关系副词往往是一个介词加上先行词的替身,在从句里作状语成分.比如This is the room where we have a meeting.这里的关系副词where,就是介词in加上先行词room的替身（所以where也能换为in which）,在从句里作地点状语.
2.关系代词：that/which,who/whom,whose,as.关系副词：when,where,why
3.关系代词which加上个介词后,往往能转化为一个关系副词,这需要根据具体的先行词来决定用什么介词.比如I won't forget the day when we were together.这里的when能转化为on which,因为和先行词day搭配的介词是on,把关系副词when在从句里还原成时间状语,就是we were together on the day.
4.介词后可加which、whom和whose
5.定语从句的主谓一致关键看先行词,先行词单数还是复数来决定从句里的动词情况.当然,有一类特殊题目要当心,比如He is one of the students who have won the prize./He is the only one of the students who has won the prize.
再问： 看不懂怎么破！QAQ
