定語從句是怎麼樣的呢?你們對這個句型瞭解多少呢?下面是小編爲大家提供的關於定語從句的詳解，內容如下：
關係副詞引導的定語從句
關係副詞可代替的先行詞是時間、地點或理由的名詞，在從句中作狀語。
1)when, where, why
關係副詞when, where, why的含義相當於介詞+ which結構，因此常常和介詞+ which結構交替使用，例如：
There are occasions when (on which) one must yield. 任何人都有不得不屈服的時候。
Beijing is the place where (in which) I was born. 北京是我的出生地。
Is this the reason why (for which) he refused our offer? 這就是他拒絕我們幫助他的理由嗎?
2)that代替關係副詞
that可以用於表示時間、地點、方式、理由的名詞後取代when, where, why和介詞+ which引導的定語從句，在口語中that常被省略，例如：
His father died the year (that / when / in which) he was born. 他父親在他出生那年逝世了。
He is unlikely to find the place (that / where / in which) he lived forty years ago. 他不大可能找到他四十年前居住過的地方。
判斷關係代詞與關係副詞
方法一： 用關係代詞，還是關係副詞完全取決於從句中的.謂語動詞。及物動詞後面無賓語，就必須要求用關係代詞;而不及物動詞則要求用關係副詞。例如：
This is the mountain village where I stayed last year.
Ill never forget the days when I worked together with you.
判斷改錯(注：先顯示題，再顯示答案，橫線;用不同的顏色表示出。)
(錯) This is the mountain village where I visited last year.
(錯) I will never forget the days when I spent in the countryside.
(對) This is the mountain village (which) I visited last year.
(對) Ill never forget the days (which) I spent in the countryside.
習慣上總把表地點或時間的名詞與關係副詞 where, when聯繫在一起。此兩題錯在關係詞的誤用上。
方法二： 準確判斷先行詞在定語從句中的成分(主、謂、賓、定、狀)，也能正確選擇出關系代詞/關係副詞。
例1. Is this museum ___ you visited a few days age?
A. where B. that C. on which D. the one
例2. Is this the museum ____ the exhibition was held.
A. where B. that C. on which D. the one
限制性和非限制性定語從句
1) 定語從句有限制性和非限制性兩種。限制性定語從句是先行詞不可缺少的部分，去掉它主句意思往往不明確;非限制性定語從句是先行詞的附加說明，去掉了也不會影響主句的意思，它與主句之間通常用逗號分開，例如：
This is the house which we bought last month. 這是我們上個月買的那幢房子。(限制性)
The house, which we bought last month, is very nice.這幢房子很漂亮，是我們上個月買的。(非限制性)
2) 當先行詞是專有名詞或物主代詞和指示代詞所修飾時，其後的定語從句通常是非限制性的，例如：
Charles Smith, who was my former teacher, retired last year. 查理史密斯去年退休了，他曾經是我的老師。
My house, which I bought last year, has got a lovely garden. 我去年買的的那幢房子帶着個漂亮的花園。
This novel, which I have read three times, is very touching. 這本小說很動人，我已經讀了三遍。
3) 非限制性定語從句還能將整個主句作爲先行詞, 對其進行修飾, 這時從句謂語動詞要用第三人稱單數，例如：
He seems not to have grasped what I meant, which greatly upsets me. 他似乎沒抓住我的意思，這使我心煩。
