定語從句里面的關(guān)系代詞的用法.
1.常用的關(guān)系代詞：which, that, who, whom.Whom現(xiàn)在用的很少.前面有介詞只能用which,不能用that.
2. 關(guān)系代詞在考試中的特殊情況.
What:
1)它是子母同體.相當(dāng)于一個關(guān)系代詞以及一個先行詞.What前面不應(yīng)該在出現(xiàn)先行詞. 如果前面已經(jīng)偶一個關(guān)系詞,就不能用what來引導(dǎo).例如：You can have everything what you like. what=all that,所以這兒不能用what.
All______ is a continuous supplying of the basic necessities of life
A. what is the need
B. the things need
C. for our needs
D. that is need
2)what單獨使用,后面不加名詞.
例如：She is not what she used to be.
3)what 后面加名詞
例如：What money I have has been given to you.
1997年考題：______he knows about it is out of date and in accurate
A. What little=All that little
B. So much
C. How much
D. So little
as
1. like
2. 作為 As a teacher.
3. when
4. 引導(dǎo)定語從句.即可引導(dǎo)限制性定語從句,也可以引導(dǎo)非限制性定語從句.引導(dǎo)限制性定語從句一般式固定用法.如as…as, such…as , the same as
as引導(dǎo)非限制性定語從句
例如：I was a boy, which you know.which可以用as替換.
As you know I was a boy.
As is so often pointed out knowledge is a two edge weapon which can be used equally for good or evil.
as引導(dǎo)限制性定語從句
考試中往往考固定搭配.
例如：Such is a student as works hard were be sure to succeed.
than作為關(guān)系代詞可以引導(dǎo)定語從句
More families consist of one parent households or two working parents; consequently, children are likely to have less supervision at home ____ was common in the traditional family structure .
A.thanB.thatC.which D.as
特點：
1) than作為關(guān)系代詞引導(dǎo)詞在從句中一般必須做主語或者作賓語.
2) than 前面的主句必須要有比較級
3) 比較級所修飾的名詞就是than指代的對象
給個最佳答案吧,這是我上新東方時做的筆記,希望對你有作用!