定語從句是英語中常見的句型，而關(guān)系詞：when,where,who,which，that等的用法又是定語從句中的高頻考點(diǎn)，為了方便考生們更好的掌握，庫課小編今天就來給大家分享定語從句中關(guān)系詞的用法，一起看看吧。
1.who
當(dāng)先行詞是指人得名詞或代詞，而且關(guān)系詞在句中作主語時(shí)，選who。
The boy who is standing over there is Tom.
He who doesn’t reach the Great Wall is not a true man.
2.whom
當(dāng)先行詞是指人得名詞，而且關(guān)系詞在句中作主語時(shí)，選whom。
This is our English teacher whom everybody likes.
3.whose
?、?當(dāng)先行詞是指人的名詞，而且關(guān)系詞在句中作定語時(shí)，選whose。
This is my deskmate whose father works in a factory.
?、?當(dāng)先行詞是指物的名詞，而且關(guān)系在句中作定語時(shí)，選whose。
We study in a classroom whose windows face to the south.
4.that
① 當(dāng)先行詞是指物的名詞，關(guān)系詞在句中作主語時(shí)，選that。
This is a machine that can walk.
?、?當(dāng)先行詞是指物的名詞，關(guān)系詞在句中作賓語時(shí)，選that。另外，that可以省略。
I like the present (that) my father sent me.
?、?當(dāng)先行詞是指人的名詞，關(guān)系詞也可選用that=who。
The boy that/who is playing football on the play ground is my brother.
5.which
當(dāng)先行詞是指物的名詞時(shí)，關(guān)系詞也可選用which，它在句中作主語或賓語，which=that。
6.下列情況下，關(guān)系詞只能選用that
?、?當(dāng)先行詞為不定代詞 something, anything, nothing, everything時(shí)。
Is there anything that I can do for you?
?、?當(dāng)先行詞為不定代詞all時(shí)。
Mr. Li does all that he can to do his work well.
?、?當(dāng)先行詞被all, some, any修飾時(shí)。
These are all the things that I have done today.
?、?當(dāng)先行詞被the only, the very 修飾時(shí)。
This is the only computer that he often turns to for help.
⑤ 當(dāng)先行詞被序數(shù)詞，形容詞最高級修飾時(shí)。
This is the cleaning room that you can see here.
?、?time 作先行詞，前面有序數(shù)詞或last修飾時(shí)。
This is the last time that I’ll give you pocket money.
?、?盡管先行詞指人，但關(guān)系詞在句中作表語時(shí)。
He is no longer the child that he used to be 20 years ago
?、?以 who開頭的特殊疑問句，盡管先行詞指人。
Who is the person that is sitting on the ground ?
?、?當(dāng)先行詞包括人和物時(shí)。
7. 下列情況下，關(guān)系詞只能選which
?、?在非限制性定語從句中。
This is my favorite pen, which I bought yesterday.
?、?先行詞不是一個(gè)詞，而是前面整個(gè)句子的概念時(shí)。
The boy is very polite, which makes his parents happy.
?、?當(dāng)先行詞指物，用“介詞+which”。
This is the pen with which I often write.
8. as
As 引導(dǎo)定語從句時(shí)，有四種情況。As在句中作主語，賓語。
① as 單獨(dú)引導(dǎo)定語從句。
As we all know (=As is known to us all), Yao Ming is a famous basketball player.
?、?the same …as… 與…一樣。
I have the same idea as you.
?、?such… as… 和…一樣。
Don’t read such a book as you can’t understand.
?、?as…as… 和…一樣。
In this library, you can borrow as many books as you can.
9. where
?、?當(dāng)先行詞是指地點(diǎn)的名詞，而且關(guān)系副詞在句中作狀語時(shí)，選where，where=介詞+which。
This is the classroom where we study.
?、?盡管先行詞是指地點(diǎn)的名詞，但關(guān)系詞在句中作主語，賓語時(shí)，只能選that/which。
This is the factory that/which makes paper.
This is the factory(that/which) we visited yesterday.
?、?盡管先行詞是指地點(diǎn)的名詞，關(guān)系詞在句中作主語，賓語，但非限制性定語從句只能用which。
This is the school, which he visited.
?、?the one 是代詞，代替前面的名詞，其后的that/which 往往省略。
Is this factory the one you visited?
?、?當(dāng)situation, job, mark, race, point 等模糊概念的名詞，關(guān)系詞在句中作狀語時(shí)，選where。
You’d better make a mark where you have any questions.
?、?盡管先行詞是指地點(diǎn)的名詞，關(guān)系詞在句中作狀語，但定語從句末有介詞時(shí)，選which。
This is the lab which we do experiments in.
10.when
① 當(dāng)先行詞是指時(shí)間的名詞，而且關(guān)系副詞在句中作狀語時(shí)，選when，when=介詞+which。
We will never forget the days when we stayed with Mr. Smith.
?、?盡管先行詞是指時(shí)間的名詞，但關(guān)系詞在句中作主語，賓語時(shí)，選that或which。
Monday is the day which/that comes before Tuesday.
We will never forget the days (that/which) we spent with him.
③ 盡管先行詞是指時(shí)間的名詞，關(guān)系詞在句中作主語，賓語，但非限制性定語從句只能選which。
Wednesday is the day, which comes before Thursday.
?、?one 作替代詞，代替前面表示時(shí)間的名詞，其后的that/which往往省略。
That was an exciting moment, one I will remember forever.
?、?time作先行詞，前面有序數(shù)詞或last時(shí)，只能選that。
Is this the third time that you have been late for school this week?
11.why
?、?當(dāng)先行詞是指表示原因的名詞reason時(shí)，如果關(guān)系副詞作狀語，選why，why=for which。
This is the reason why I didn’t attend the meeting yesterday.
?、?當(dāng)先行詞是表示原因的名詞reason時(shí)，如果關(guān)系副詞在句中作賓語，選that/which,也可省略。
My parents didn’t believe the reason (that/ which) I give him.