1.who指人,在從句中作主語,不可省略.
2.whose指人也可指物,在從句中作定語,不可省略.
3.that多數(shù)指物,有時也可指人,只限用于限制性定語從句,在從句中作主語、賓語.作賓語時可省略.
4.which指物,在從句作主語、賓語,在限制性定語從句中作賓語時可省略
首先你自己應(yīng)該看看語法書,大多數(shù)語法書首章都是句子結(jié)構(gòu)多看些例句就好了
我給你簡單解釋一下
表語就是BE 動詞 或者是感官動詞后面的成分,它所表示的是主語的狀態(tài)或者特征等.
eg : i am tall .這里面的tall 就是表語,表示主語的特征就是tall
it tastes good這里的good 是表語.
定語就是起限制修飾作用的成分,
eg:she is abeautiful girl .這里的beautiful 是定語.
你如果是初中的學(xué)生,那么你只需要掌握下面的,但是高中就不是了
1）who: 當先行項指人時,在定語從句中作主語.
eg: The student who answered the question was John.
The man who was here yesterday is a artist.
2）whom: 當先行項指人時,在定語從句中作賓語.
eg: The man whom I saw is called Smith.
The professor whom you wish to see has come.
3）which: 當先行項指物時,在定語從句中作主語、賓語.
eg: This is the book which has been translated into many languages.（主語）
He doesn’t know the rule which everybody knows.（賓語）
4）that: 當先行項指人、物時,在定語從句中作主語、賓語.
eg: The building that stands over there is a hospital.
The letter that I received form him yesterday is very important.
Is he the man that sells eggs?
He is the man that we are looking for.
2. 關(guān)系副詞（在定語從句中作狀語）：when, where, why…
1）when: 時間狀語
eg: He came last night when I was out.
2）where: 地點狀語
eg: That is the place where he once lived.
3）why: 原因狀語（why只有限定用法,而非限定用法則用for which reason）
eg: He refused to disclose the reason why he did it.
The reason why I was late is that there was a traffic jam on my way here.
4）先行詞為the way 用in which或that 引導(dǎo),不能用how引導(dǎo).
eg: The way (that/ in which) you answered the questions was admirable.
This is the way he behaves.
5）關(guān)系副詞的轉(zhuǎn)化：關(guān)系副詞 = 介詞 + which
eg: This is the place where (= in which) I lived when I was young.