墨尔本文波雅思为大家视频讲解定语从句的相关语法应用。定语从句指的是在复合句中充当定语成分的一个句子，由关系词引导。其中，关系代词有who, whom, which,that, whose,
关系副词有when, where, why.
提示：绝对没有what!
After a whole day of hard work, all what he wanted was a nice meal & a good rest. 是错误的哦！
定语从句的重要意义！
Yesterday I ran into an old friend.
I hadn’t seen him for years.
Yesterday I ran into an old friend (whom/ that) I hadn’t seen for years.
一、 限定性定语从句
1)that 可以代替其他关系词如who, whom, which用于指人或物，但绝不能代替whose.
2)当关系词充当从句中的宾语成分时，可以省略，但充当主语时不能省。
经典例句：
This is the book you were looking for.
Tom is a boy who always tells lies.
3) 必须用that引导的定语从句 (that有时可以省略)：
1. noun= any body
some one
every thing
no where
all/ much/ none/one
All is not gold that glitters.
2. noun = …est
The only
The 1st
The last
The next
The very
The right
This is the very book (that) I need.
小结：当that做定语从句的宾语时，可以省略。
④as也可引导限定性定语从句， 先行名词被so, as, such, the same修饰，从句的引导词用as
I have never seen such a boring guy as he is before.
This is exactly the same camera as (that) I have lost.
