當兩個指同一人或事物的句子成分放在同等位置時，若其中一個句子成分是用於說明或解釋另一個句子成分的，那麼用於起說明或解釋作用的句子成分就叫做另一成分的同位語。如：
Laura Myers, a BBC reporter, asked for an interview. 蘿拉·邁爾，BBC的記者，要求採訪。
Influenza, a common disease, has no cure. 流行性感冒是一種常見病，無特效藥。
Mary, one of the most intelligent girls I know, is planning to attend the university. 瑪麗是我所認識的最聰敏的姑娘之一，她正準備上大學。
Who is that man, the first in the front row? 前排第一個人是誰?
We have two children, a boy and a girl. 我們有兩個孩子，一個男孩和一個女孩。
以上所舉的同位語例子都是同位語的基本形式，一般不會出錯。但有有幾種同位語，或由於身本結構特殊，或由於它修飾的成分結構比較特殊，往往會引起誤解。現小結並舉例說明如下，希望引起同學們的注意。
一、代詞we, us, you等後接同位語
Are you two reading? 你們二人在看書嗎?
They three joined the school team. 他們3人參加了校隊。
She has great concern for us students. 她對我們學生很關心。
He asked you boys to be quiet. 他要你們男孩子安靜些。
We girls often go to the movies together. 我們女孩子經常一起去看電影。
【溫馨提示】若能在書面表達中巧妙地用上一兩處這樣的同位語，也可以算為你的作文增加了一個小亮點。
二、不定式用作同位語
Soon came the order to start the general attack. 很快下達了發起總攻的命令。(to start the general attack與the order同位)
He followed the instruction to walk along a certain street where I picked him up. 他照吩咐沿某一條街走，我在那裡接他上了車。(to walk along…與the instruction同位)
【溫馨提示】當心單項填空就這類結構命題。
三、-ing分詞用作同位語
He’s getting a job tonight driving a truck. 他今晚得到一個開卡車的差事。(driving a track與a job同位)
She got a place in a laundry ironing shirts. 她在一家洗衣店得到一個熨衣服的職位。(ironing shirts與a place同位)
The first plan, attacking at night, was turned down. 第一個計劃是夜襲，被拒絕了。(attacking at night與the first plan同位)
【溫馨提示】當心單項填空就這類結構命題。
四、形容詞用作同位語
The current affair, the biggest in its history, is being held in Guangzhou. 目前的交易會，是有史以來規模最大的，正在廣州舉行。
He read all kinds of books, ancient and modern, Chinese and foreign. 他讀了很多書，古今中外都有。
People, old and young, took to the streets to watch the parade. 老老少少的人都來到街頭觀看遊行。
【溫馨提示】這類同位語與定語比較接近，可轉換成定語從句。如：
The current affair, the biggest in its history, is being held in Guangzhou.
=The current affair, which is the biggest in its history, is being held in Guangzhou.
五、none of us之類的結構用作同位語
We none of us said anything. 我們誰也沒說話。
We have none of us large appetites. 我們誰飯量都不大。
They neither of them wanted to go. 他們兩人都不想去。
They』ve neither of them succeeded in winning her confidence. 他們兩人誰也沒能贏得她的信任。
【溫馨提示】注意，同位語並不影響其後句子謂語的「數」，如：
學生每人都有一本詞典。
正：The students each have a dictionary.
誤：The students each has a dictionary.
請比較下面一句（謂語用了單數，因為each為句子主語）：
正：Each of the students has a dictionary.
六、從句用作同位語（即同位語從句）
They were worried over the fact that you were sick. 他們為你生病發愁。
I received a message that she would be late. 我得到的信息說她可能晚到。
The news that we are having a holiday tomorrow is not true. 明天放假的消息不實。
The idea that you can do this work without thinking is wrong. 你可以不動腦筋做此工作的想法是錯誤的。
【溫馨提示】同位語從句似乎是近年來高考英語的一個新熱點，希望同學們引起注意。下面請看幾道真題（答案分別為ABBC）：
1. There is much chance _________ Bill will recover from his injury in time for the race. (天津卷)
A. that B. which C. until D. if
2. —It’s thirty years since we last met.
—But I still remember the story, believe it or not, _________ we got lost on a rainy night. (四川卷)
A. which B. that C. what D. when
3. Doris』 success lies in the fact _________ she is co-operative and eager to learn from others. (上海卷)
A. which B. that C. when D. why
4. A warm thought suddenly came to me _________ I might use the pocket money to buy some flowers for my mother’s birthday.(www.nmet168.com) (安徽卷)
A. if B. when C. that D. which
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