定語從句，一個(gè)簡單句跟在一名詞或代詞后(先行詞)進(jìn)行修飾限定，所以叫做定語從句。在主句中充當(dāng)定語成分。那么你知道定語從句的用法嗎?下面跟著小編一起來學(xué)習(xí)一下，希望對(duì)大家的學(xué)習(xí)有所幫助!

一、基本概念：

　　在復(fù)合句中，修飾某一名詞或代詞的從句叫定語從句。如：

　　Do you know the man who spoke at the meeting just now?

　　That is the house where he lived ten years ago.

　　定語從句所修飾的詞叫先行詞;定語從句一般用關(guān)系代詞或關(guān)系副詞來引導(dǎo)，關(guān)系詞放在先行詞與定語從句之間起連接作用，同時(shí)又作從句中的一個(gè)成分。

　　引導(dǎo)定語從句的關(guān)系代詞有：that, who, whom, whose, which;

　　關(guān)系副詞有：when, where, why.

二、關(guān)系詞的用法：

　　(一)關(guān)系代詞的用法：

　　1. 作主語用who, which和that, 如：

　　He is the man who/that lives next door.

　　The train which/that has just left is for Shenzhen.

　　2. 作賓語用whom, who, which, that, 如：

　　The man (whom/who/that) we have just seen is a famous writer.

　　Where is the book (which/that) I bought last week?

　　注：在非正式文體中，用于指人的關(guān)系代詞who whom, that 通常可以省略，但在正式文體中通常用whom, 不可省略;用于指物的關(guān)系代詞which和that 在非正式文體中也通常省略，但在正式文體中一般不省略。

　　3. 作定語用whose, 如：

　　(a) He is the man whose car was stolen last week.

　　(b) It was a meeting whose importance I did not realize at that time.

　　注：“whose +名詞中心詞”這一結(jié)構(gòu)在定語從句中既能作主語(如上a句)，又能作賓語(如上b句)。whose 的先行詞常用來指人，但有時(shí)也可以用來指具體事物或抽象概念，這時(shí)可以與of which 結(jié)構(gòu)互換，詞序是：“名詞+of which”，如：

　　They came to a house whose back wall had broken down.. (= the back wall of which)

　　He’s written a book the name of which I’ve completely forgotten. (= whose name)

　　4. 作表語只用that ，它既可以指人，也可以指物，但時(shí)常省略。如：

　　He is no longer the man that he used to be.

　　This is no longer the dirty place (that) it used to be.

　　(二)關(guān)系副詞的用法：

　　1.when 指時(shí)間，在從句中作時(shí)間狀語，它的先行詞通常有：time, day, morning, night, week, year 等。如：

　　I still remember the time when I first became a college student.

　　Do you know the date when Lincoln was born?

　　注：when時(shí)常可以省略，特別是在某些句型和某些時(shí)間狀語中。如：

　　Each time he came, he did his best to help us.

　　But help never stopped coming from the day she fell ill.

　　2.where指地點(diǎn)，在從句中作地點(diǎn)狀語。它的先行詞通常有：place, spot, street, house, room,

　　city, town, country等，如：

　　This is the hotel where they are staying.

　　I forget the house where the Smiths lived.

　　注：where有時(shí)也可以省略。如：

　　This is the place (where) we met yesterday.

　　3. why指原因或理由，它的先行詞只有reason。如：

　　That is the reason why he is leaving so soon.

　　注：why時(shí)常也可以省略。如：

　　That is the real reason he did it.

　　(三) 使用關(guān)系副詞應(yīng)注意下列幾點(diǎn)：

　　1. 這三個(gè)關(guān)系副詞在意義上都相當(dāng)于一定的介詞+which結(jié)構(gòu)：

　　when = on (in, at, during…) + which;

　　where = in (at, on…) + which;

　　why = for which. 如：

　　I was in Beijing on the day when (=on which) he arrived.

　　The office where (=in which) he works is on the third floor.

　　This is the chief reason why (=for which) we did it.

　　2. 當(dāng)先行詞是表時(shí)間的time, day等和表地點(diǎn)的place, house等時(shí)，一定要注意分析從句的結(jié)構(gòu)，如果缺少主語或賓語時(shí)，關(guān)系詞應(yīng)該用which或that, 缺少時(shí)間狀語或地點(diǎn)狀語時(shí)，才能用when或where，試比較：

　　I’ll never forget the day when my hometown was liberated.

　　I’ll never forget the days which/that we spent together last summer.

　　His father works in a factory where radio parts are made.

　　His father works in a factory which/that makes radio parts.

　　3. when和where既可以引導(dǎo)限制性定語從句，也可以引導(dǎo)非限制性定語從句。而why 只

　　能引導(dǎo)限制性定語從句。

　　三.限制性定語從句與非限制性定語從句

　　1.限制性定語從句說明先行詞的`情況，對(duì)先行詞起限定作用，與先行詞關(guān)系十分密切，不可用逗號(hào)隔開，也不可省略，否則全句意義就不完整。如：

　　This is the telegram which he refers to.

　　Is there anything (that) I can do for you?

　　2.非限制性定語從句只是對(duì)先行詞作補(bǔ)充說明，沒有限定作用，它與先行詞的關(guān)系比較松散，因而不是關(guān)鍵性的，如果省略，原句的意義仍然完整。這種從句在朗讀時(shí)要有停頓，在文字中通常用逗號(hào)與主句隔開。如：

　　This note was left by Tom, who was here a moment ago.

　　As a boy, he was always making things, most of which were electric.

　　引導(dǎo)非限制性定語從句的關(guān)系詞有：who, whom, whose, which, when 和 where，不可以用that和why。

　　另外，非限制性定語從句從意義上講，相當(dāng)于一個(gè)并列句，在口語中使用并不普遍，在日常生活中，人們通常用并列句或簡單句來表達(dá)。如：

　　I told the story to John, who later did it to his brother.

　　= I told the story to John, and he later told it to his brother.

　　Yesterday I happened to see John, who was eager to have a talk with you.

　　= Yesterday I happened to see John and he was eager to have a talk with you.

　　3.兩種定語從句的內(nèi)涵不同，限制性定語從句具有涉他性，而非限制性定語從句具有 唯一性，這在理解和翻譯時(shí)應(yīng)特別注意。試比較：

　　All the books there, which have beautiful pictures in them, were written by him.

　　All the books there that have beautiful pictures in them were written by him.

　　His brother, who is eighteen years old, is a PLA man. (只有一個(gè))

　　His brother who is a PLA man is eighteen years old. (不止一個(gè))

　　4.有時(shí)，非限制性定語從句所修飾的不是某一個(gè)詞，而是整個(gè)主句或是主句中的一個(gè)部分，這時(shí)一般采用which或as來引導(dǎo)。如：

　　He passed the exam, which/as he hoped he would.

　　注：(1)as引導(dǎo)的從句可以放在主句之前，而which引導(dǎo)的從句只能放在主句之后。

　　They are hollow, which makes them very light.

　　As is known to all, Taiwan is a part of China.

　　(2)從意義上講，which指前面主句的內(nèi)容;而as指代的是作為一般人都知道的常

　　識(shí)性的東西，因此常譯成“就象… …那樣”。

　　(3)如果定語從句的內(nèi)容對(duì)主句的內(nèi)容起消極作用，則用which，而不用as，如：

　　She stole her friend’s money, which was disgraceful.

　　He tore up my photo, which upset me.

　　5.在正式文體中，以the way為先行詞的限制性定語從句通常以in which或 that 引導(dǎo)，如：

　　The way in which you answered the questions was admirable.

　　但在非正式文體中，人們通常省略in which或 that :

　　The way (in which) he spoke to us was suspicious.

　　I don’t like the way (that) you laugh at her.