1.先行詞指物,在句中作主語或賓語which:
Her house,which was built a hundred years ago,stood still in the earthquake.(那座房子在地震中依然聳立，它是一百多年前建造的。)
注意：無論先行詞指人或者指物,在句中作主語或者作賓語，非限制性定語從句的引導詞都不能用that。
2.先行詞在句中作定語，無論指人或者指物,引導詞都用whose:
The girl,whose name is Kate,is the top of the students in our school.(那個女孩是我們學校最優秀的學生，她的名字叫Kate。)
The book,whose cover is red,is mine.(封面是紅色的那本書是我的。)
3.先行詞指人,在句中作主語who:
John,who is only five,has an inborn talent for music. (約翰是一外5歲大的孩子,有着天生的音樂才能。)
4.先行詞指人,在句中作賓語whom:
His wife,whom you met at my home,was a teacher.
(他的妻子，就是你在我家遇見的'那個，是一位老師。)
5.先行詞指物，在句中作時間狀語用when：
The sports meeting will be put off till next month,when we will have made all the preparations.(運動會將被推遲到下個月，那時我們做好一切準備。)
next day we arrived in New York,where we were inerviewed on the radio.(第二天我們到達紐約，在那裏我們接受了電臺的採訪。)
7.如果先行詞作介詞的賓語，先行詞指人，介詞提前的結構是：介詞+whom;先行詞指物，介詞提前的結構是：介詞+which:
President Wilson,with whom he had not the same intimate relations,is treated much less sympathetically.(威爾遜總統與他沒有同樣的親密關係，所以就沒有被很同情地對待。) The Second World War,in which millions of people were killed,ended in 1945.(第二次世界大戰造成數百萬人的死亡，於1945年結束。)
也可以引導定語從句，常與such連用：
Such people as you describe are rare nowadays.(象你所描繪的那種人現在已經很少見了。) Let's disscuss only such questions as concern us.(讓我們只討論那些和我們有關的問題吧。) 注意：the same that+從句，意思是：正是那一個人或物;the same as+從句，意思是：就像某個人或物：
He is the same man that you are looking for.(他就是你要找的那個人。)
He is the same man as you met in the street.(他很象你昨天在街上遇見的那個人。實際上並不是那個人。)
This is the same pen that I lost yesterday.(這就是我昨天丟失的那支筆。)
This is the same pen as I lost yesterday.(這很像昨天我丟失的那支筆。)
