先从简单的说起。
深入灵魂的问题4:什么是定语？？
答：修饰和限定名词或者代词的成分。
你们要是把定语跟形容词划等号我也不拦着～
毕竟大部分情况下是酱紫。
别的情况此处不展开啦～
接下来进入正文
先发问：
依据我给出的定语概念，小可爱们能不能推出神马是定语从句？
↓↓↓
so easy！
定语从句：修饰和限定名词或者代词的成分句子。
PS：定语从句肯定是要放在被修饰词后面的啦，不然头都要大了～
呐，表演给你们看：
定语从句内容详解
请根据上面的句子迅速回忆从句的两大特征：
1. 引导词
2. 从句为陈述语序
ok，收！回忆到这里就好，不用去想名词性从句，没半毛钱关系。
看这里：
重点解释下第三句，也就是whom这个引导词的用法。
作为宾格的时候，who和whom可以通用，当然which和that也可以通用。
比如酱紫：
People need friends who (whom) they can share secrets with.
I still remember the villa which (that) we stayed in for the summer vacation.
这两个句子的特点是从句中的谓语动词为词组，如果我们把词组中的介词提前到引导词前，那就只能是酱紫了：
People need friends with whom they can share secrets.
I still remember the villa in which we stayed for the summer vacation.
也就是介词提前的话，修饰人的时候只能用whom，修饰物的时候只能用which啦～
◆ 引导从句且在从句中做所有格whose（跟名词一起构成成分）
内心OS.：这两句中whose+ parents／whose+ leading actress一起构成主语，毕竟whose只能表示…的。
到这个地方为止，我把定语从句关系代词的内容都梳理完了～满满的干货啊有没有。快点赞评论！！不然哭给你们看！！
不过根据考点呢，有个非常重要的内容还是要补充说一下：
辣就是只用that的情况：
1.当先行词是everything, anything, nothing ，all, none, few, little, some等不定代词时，或当先行词受every, any, all, some, no, little, few, much等词修饰时。如：Have you set down everything that Mr Li said?
2.当先行词被序数词修饰时。如：
The first American movie that I watched was the Titanic.
3.当先行词有人又有物时。
如：When she came back from abroad, Lucy told us about the cities and the people that she had visited.
4.当先行词被形容词最高级修饰时。
如：This is the best movie that I have ever seen.
5.当先行词被the very, the only, the first / last等修饰时。如： She is the only person that understands me.
6.当先行词前面有who, which等疑问代词时。如： Who is the man that is standing in front of the crowd?
收～唉？你问我定语从句和同位语从句的区别？？
下次说！！！
练习如下：（答案见明天首条评论噢）
1.Sorry, we don’t have the coat ________ you need.
A. what B. who C. whom D. which
2. Do you know the man ________ is sitting behind Nancy?
A. what B. which C. who D. whom
3. I have found some pictures of the most interesting places ________ you can visit during the winter holidays.
A. where B. which C. what D. that
4. That is the only thing ________ I bought from the supermarket.
A. which B. that C. what D. where
5. That is the poor boy ________ father died in a traffic accident last year.
A. who B. whom C. whose D. which
