这么知道什么时候用人称代词和物主代词.我不要乱的答案.答对在加分.

代词是代替名词的一种词类.大多数代词具有名词和形容词的功能.英语中的代词,按其意义、特征及在句中的作用分为：人称代词、物主代词、指示代词、自身代词、相互代词、疑问代词、关系代词和不定代词八种.

一、人称代词是表示"我"、"你"、"他"、"她"、"它"、
"我们"、"你们"、"他们"的词.人称代词有人称、数和格的变化,见下表：

数 单数 复数
格 主格 宾格 主格 宾格
第一人称 I me we us
第二人称 you you you you
he him they them
第三人称 she her they them
it it they them

如：Heismyfriend. 他是我的朋友.
It’sme. 是我.

二、物主代词表示所有关系的代词,也可叫做代词所有格.物主代词分形容性物主代词和名词性物主代词二种,其人物和数的变化见下表.


数 单数 复数
人称 第一 第二 第三 第一 第二 第三
人称人称 人称 人称 人称 人称
形容词性 my your his/her itsouryour/their
物主代词

名词性 mineyourshis/hersitsoursyours/theirs
物主代词

如：Ilikehiscar.
我喜欢他的小汽车.
Ourschoolishere,andtheirsisthere.
我们的学校在这儿,他们的在那儿.

三、指示代词表示"那个"、"这个"、"这些"、"那些"等指示概念的代词.指示代词有this,that,these,those等.
如：Thatisagoodidea. 那是个好主意.

四、表示"我自己"、"你自己"、"他自己"、"我们自己"、"你们自己"和"他们自己"等的代词,叫做自身代词,也称为"反身代词".
如：Shewastalkingtoherself. 她自言自语.

五、表示相互关系的代词叫相互代词,有eachother和oneanother两组,但在运用中,这两组词没什么区别.
如：Theyloveeachother. 他们彼此相爱.

六、不是指明代替任何特定名词的代词叫做不定代词.常见的不定代词有a11,both,each,every等,以及含有some-,any-,no-等的合成代词,如anybody,something,noone.这些不定代词大都可以代替名词和形容词,在句中作主语、宾语、表语和定语, 但none和由some,any,no等构成的复合不定代词只能作主语、宾语或表语；every和no只能作定语.如：

---Doyouhaveacar? --你有一辆小汽车吗?
---Yes,Ihaveone. --是的,我有一辆.
---Idon’tknowanyofthem. 他们,我一个也不认识.

七、疑问代词有who,whom,whose,what和which等.在句子中用来构成特殊疑问句.疑问代词都可用作连接代词,引导名词性从句（主语从句、宾语从句和表语从句）
如：Tellmewhoheis. 告诉我他是谁.

八、关系代词有who,whom,whose,that,which,as等,可用作引导从句的关联词.它们在定语从句中可作主语、表语、宾语、定语等；另一方面它们又代表主句中为定语从句所修饰的那个名词或代词（通称为先行词）.
如：Heisthemanwhomyouhavebeenlookingfor. 他就是你要找的那个人.

代词的用法
几类代词的相应形式:
人称代词
物主代词
反身代词
主格
宾格
形容词性
名词性
单数
I
I 我
me我
my我的
mine我的
myself我自己
II
you
you
your
your
yourself
III
he
him
his
his
himself
she
her
her
hers
herself
it
it
its
its
itself
复数
I
we
us
our
ours
ourselves
II
you
you
your
yours
Yourselves
III
they
them
their
theirs
themselves
人称代词的用法:1,主格作主语或表语:
She and Tom are good friends.
It's she who wants it.
2. 宾格作及物动词和介词的宾语,还可作表语.
Aunt Li took care of us.
Who is knocking at the door It's me.
物主代词的用法:
形容词性物主代词只能做定语,修饰名词,相当于形容词.
My mother is a nurse in a hospital.
Their teacher is coming here.
名词性物主代词可以做主语,宾语和表语,相当于名词.
This is my pen, yours is lost.(yours=your pen)
The best composition is hers. (hers= her composition)
I can't find my ruler, I have to use hers. (hers = her ruler)
反身代词的用法:
反身代词表示主语发生的动作落在主语自己身上,或用来加强名词或代词的语气.
作主语:I hope he didn't hurt herself. She taught herself English.
同位语: You yourself said so. You can do it yourself.
常与以下动词连用:
hurt, dress, enjoy, say to, talk to, teach, wash, help
还可以与介词连用:by oneself [自己(不需要别人帮忙)] for oneself (替自己,为自己)
to oneself(供自己用)
不定代词及用法:
(一)可分为普 通不定代词,个体不定代词和数量不定代词:
通不定代词:some, any, no, somebody, nobody, anybody, someone, anyone, no one, something, anything, nothing, one
个体不定代词:all, every, each, other, another, either, neither, both, everybody, everyone, everything
数量不定代词:many, much, few, a few, little, a little, a lot of, lots of
(二) 普通不定代词的用法(部分):
some一般用于肯定句, 当预期对方作肯定回答时也用于疑问句:
Could you please give me some information about ir
还用于表示要求和提供某物的句子:
Would you like some tea
2. any 的用法: (1)用于否定句及含有否定意义词(hardly, never, no)的句子中:
I have hardly any time.
(2)用于疑问句中和条件句中: Do you see any birds in the tree
(3) some, any, no, 与 one, thing, body 构成的合成词的用法:这些代词都表示单数的概念,some, any与one, thing, body构成的合成词的区别与和的用法基本相同.
There is someone looking for you outside.
If you want anything, call me, please.
这些代词如被定语修饰, 应放在定语前,如被else修饰,也放在else前:
Is there anything new in the newspaper
I'm afraid I can't help you, you'd better ask someone else.
3. other, another 的用法:
两者均可指人,也可指物,other 意为 "另外",不确指,需要确指时前加定冠词the, the other,意为 another"另一个":
other: (1)后跟名词(单,复),泛指 "别的,其他的"
The Great Wall is longer than any other wall in the world.
I'll go swimming with other friends tomorrow.
the other后跟名词单或数,或后不跟名词, 特指两者中的另一个:
At last we got the other side of the river.
Thirty are girls and the other students are boys in our class.
I have two pens, one is blue and the other is red.
(3) others 后不加名词,泛指另外一些别的人或事物;the others 特指其余所有的人或事物:
Some of us like playing table-tennis, and others like playing basketball.
Thirty in our class are girls, and the others are boys.
(4) 泛指三者以上的 "一些"不用加the, 用 "some…. others"的形式:
Some people like it, others not.
another:
泛指另一个,不与the连用,只能跟可数名词单数:
I don't like this one, will you please show me another
We asked him to sing us another song.
4.both, either, neither的用法:他们均用于两者之间,neither, either用做单数,both用做复数,
both:肯定句中表示"两者都",用于否定句中表示 "两者不都",即部分否定:
Both of the sisters are good at English.]
Not both of them are good at English.(One is good at English, the other isn't.)
I don't know both his brothers. (I only know one of them.)
Both,and, 连接两个主语时谓语动词用复数:
Both my bothers and I are teachers.
(2) neither: 表示"两个都不", either表示"两个中的任何一个", neither是 either的否定形式,两者均表示单数形式,做主语时谓语动词用单数形式:
Either you or he is right.
Neither he nor you is right.
neither是both的反义词,做形容词时与单数名词连用,不用the:
Neither pen writes good.= Neither of the pens writes good.
Neither…nor…, either…or….
Eihter you or I am right.
Nether you nor I am right.=Both you and I are right.
5. (a) little, much, (a) few, many 的用法:
little "很少"表否定, a little "少许"表肯定, much= not a little:
I know little about him. 我不了解他.
I know much about him. 我对他很了解.
There is little to be done, is there
There is a little to be done, isn't there
在对不可数名词提问时要用how much:
I spent a lot of money on books. How much did you spend on books
as little as "尽可能少的" as much as " 尽可能多的" as… as…结构中不用 a little
Few 表示 "很少" 表否定含义, a few "有一些"表肯定含义, many= not a few ""许多,不少, 这三个词用于修饰可数名词:
Few of us understand our teacher.
A few of us understand our teacher.
His book has few readers, does it
His book has a few readers, doesn't it
as few as "尽可能少" as many as "和……一样多" as…as…. 结构中不用a few

my, our, your, his, her, its,their等都是形容词性物主代词，意思上都有个“的”字。他们的后面都必须接个名词，即必须用来修饰名词，作定语用。

形容词性物主代词只能作定语，后面必须跟有名词。名词性物主代词=形容性物主代词+名词，可用作主语，宾语，表语等，具有名词的作用。形容性物主代词一般后面接名词，名词性物主代词放在句子末尾。
我向你担保，我说的没一句假话。