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三、只见一叶障目，不见一片森林
定语从句中关系代词who指人，是主格，在从句中做主语；whom是宾格，在从句中作宾语；whose是所有格，在从句中作定语，是定语从句中表示所属关系的引导词，意为“……的”，既可以指人，也可以指物。然而，有些老师只告诉学生whose意为“谁的”。如：
A. He is talking with the girl whose brother is my classmate. 他正在和那个弟弟是我同学的女孩说话。
B. This is the boy whose father is our English teacher. 这就是那个父亲是我们英语教师的男孩。
可是，一旦whose出现在这样的句字里，学生就不知所云。如：
C. He lives in a house whose window opens to the south. 他住在一间窗户朝南开的房子里。（whose意为“房子的”）
I have just bought a new bike whose color is white. 我刚买了一辆白颜色的自行车。（whose意为“新自行车的”）
有些人认为whose的意思是“谁的”，只能表示人的所属关系，这是一种错误的认识，应该纠正过来。
四、重视机械接受，缺乏机动灵活
that与which都可以修饰表示物的先行词。于是，只要一见到表示物的先行词，学生都用这两个关系代词引导。殊不知，有些情况下只能用that引导，不能用which；有些情况下只能用which引导，不能用that。
1. 先行词为all、everything、something、anything、nothing时只能用that引导。
A. Please tell me all (that) you know. 请告诉我你所知道的一切。
B. I’ll tell you everything (that) I saw in the United States. 我会把在美国看到的事情告诉你。
C. I’d like to tell you something that will make you surprised. 我想告诉一件使你感到惊奇的事。
D. Is there anything (that) I can do for you? 有什么需要帮忙的吗？
E. There is nothing that has to be done today. 今天没有任何事情可做。
2. 先行词被数词，最高级形容词以及the very、the only、the last等修饰时只能用that引导。
A. The first student that put up hands was Zhang ping. 第一个举手的是张萍。
B. Agriculture was the most important invention that led to the beginning of civilization. 农业是导致文明开始的最重要的发明。
C. This is the very pen (that) he is looking for. 这正是他在寻找的钢笔。
D. That is the only English book (that) he bought from the bookstore yesterday. 这就是他昨天从书店买的唯一的那本英语书。
3．先行词中既有人又有物时只能用that引导
A. Henry and his dog that appeared in street last week disappeared mysteriously in the forest yesterday. 亨利和他的小狗上周还在街上，昨天又神秘地消失在树林里。
B. we were deeply impressed by the teachers and schools that we had visited. 我们访问过的老师和参观过的学校给我们留下了深刻的印象。
4. 先行词在主句中作表语，或关系代词在从句中作表语时。
A. It is a dictionary that will help you a lot. 这是本对你很有帮助的字典。
B. He is no longer the man that he was in our university. 他再也不是我们大学时的他了。
5．关系代词前有介词时不用that。
This is the house in which I lived ten years ago. 这就是我十年前住过的房子。
6. 先行词本身是that时不用that。
I will tell you that which he said yesterday. 我会告诉你他昨天说的话。
7．引导非限制性定语从句时不用that。
A. I have lost my mobile phone, which is bought by my father. 我丢了手机，那是我爸爸为我买的。
B. She entered a new vocational and technical college, which made her mother very happy. 她上了一所新职业技术学院，这使她母亲非常高兴。
