初中英语语法问题。。。。好难啊

Question

实在搞不懂whom什么时候用,书上说做宾语的时候用,我还是不太明白.举个例子就最好了
在从句中做介词的宾语时,where和when都可以转换成in which,那么在从句中做介词的宾语时又是什么意思?举个例子吧

Answer 1

whom就是who的宾格，就是whom在从句中作宾语时就用whom，比如说
He is the man whom I turn to for help.其实就是I turn to whom for help。
同理，在从句中作介词的宾语其实就是正常语序下的介宾结构啊，就说上面这句话，to是介词，whom和to构成介宾短语，in which也是这个道理，比如说 this room is the one where（in which） I ever lived 。正常语序肯定是live in the room，所以用which是对room提问，用where就是对in the room 提问了。

Answer 2

whom现在很少用了 全部可以用who代替
Whom 出现在从句里面时，所有用whom的地方都可以用who代替。Whom 这个词只出现在很正式的书面语。口语不用。
2． Whom 在介词（如 to, from, at, of..）后面时，不可替换。
Who told you the story? （主语）
Who is that man over there? （主语补语）
Whom/ Who did you meet at the airport? （宾语）
Whom did you give the book to? （介词宾语）
whom是who的宾格，在现代英语中一般只用于书面体，在口WHO 可以做主语，又可以做宾语
WHOM只能做宾语
例子：1,who are you? 不能是whom are you?
2,This book belongs to whom/who?两者都可以语中通常用who，但在介词后只能用whom。

Answer 3

关系代词引导的定语从句

1.who指人在从句中做主语
(1) The boys who are playing football are from Class One. 在踢足球的男孩们是一班的.
(2) Yesterday I helped an old man who lost his way. 昨天，我帮助了一个迷路的老人.
2. whom指人，在定语从句中充当宾语，常省略。（注：who和whom已无太大区别，基本可以通用。唯一区别是who可以做主语而whom不可以。）
(1) Mr. Liu is the person (whom) you talked with on the bus. 刘先生就是在公交车上和你聊天的那个人.
(2) Mr. Ling is just the boy whom I want to see. 凌先生恰巧就是我想见的那个男孩.
(3) The man who/whom you met just now is my friend. 你刚刚见到的那个人就是我的朋友.
注意：关系代词whom在口语和非正式语体中常用who代替，可省略。
如果在从句中做宾语,就用whom或who.比如: He is the man whom/who I talk to. 他就是那个和我聊天的男人.
如果是在从句中作主语就只能用who.比如: He is the man who has an English book. 他就是那个有英语书的男人.

关系副词引导的定语从句

1. when指时间，在定语从句中做时间状语
(1) I still remember the day when I first came to the school.
(2) The time when we got together finally came.
2. where指地点，在定语从句中做地点状语
(1) Shanghai is the city where I was born.
(2) The house where I lived ten years ago has been pulled down.
3. why指原因，在定语从句中做原因状语
(1) Please tell me the reason why you missed the plane.
(2) I don’t know the reason why he looks unhappy today.
注意：关系副词引导的从句可以由“介词+关系代词”引导的从句替换
(1) The reason why/ for which he refused the invitation is not clear,
(2) From the year when/in which he was going to school he began to know what he wanted when he grew up.
百科定语从句解释得很系统，去看看吧，多看些例子就会弄明白的！
http://baike.baidu.com/view/56536.html?wtp=tt

参考资料：http://baike.baidu.com/view/56536.html?wtp=tt