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2，用法
(1)主格作主语(zhuyu)--Oh,there is someone in the room.
---_ must be my brother.A.He B.This C.It
(2)宾格作宾语，跟在及物动词和介词后面作宾语I can`t find the pen Iwas given.Have you seen _?
A.it B.one C.this D.that
(3)顺序：单数231，复数123，承担责任我在前--Who broke the door?--I and Tom.
(4)it还可指代时间、天气和距离
--What time is it now?--It`s six thirty.
It was raining this morning.
How far is it from your home to our school?
二、物主代词
1、可分为形容词性的物主代词和名词性的物主代词名词性的物主代词相当于形容词性的物主代词加上相应的名词
I have lost my pen.Please lend me yours.(yours=your pen)
2、形容词性的物主代词和名词连用，放在名词前面Bill is in the classroom,doing _his homework.
A.he B.him C.his D.himself 3、名词性的物主代词相当于形容词性的物主代词加上相应的名词
(1)I have lost my pen.Please lend me yours.(yours=your pen)
(2)--Is this your son`s sweater?--No._is on the chair behind the desk.
三、反身代词
1、单数加-self，复数加-selves 2、作主语(zhuyu)或宾语的同位语(1)He himself was adoctor.(2)She wants to meet the singer himself.
3、带有反身代词的固定短语：
enjoy oneself(玩得高兴),teach by oneself(自学),hurt oneself(伤了某人自己),
dress oneself(自己穿衣),call oneself(自称),behave oneself(守规矩)，for oneself(为了某人自己),
look after/take care of/care for oneself(照顾自己),say/talk to oneself(自言自语),help oneself(随便吃)
[Help yourself to some fish!],all by eg.No one helped Mary.She did it all by _.
四、指示代词
1、this(这)、these(这些)指在时间空间上距说话人较近的人或物;that(那)、those(那些)在时间空间上距说话人较远的人或物。
_ have finished the work can leave.A.Those who B.Anyone C.The one who 2、特殊用法
(1)为了避免重复，用that而不是用this代替前面出现过的不可数或单数名词，用those而不是用these代替前面出现过的复数名词。
The weather of Kuming is better than that of Beijing.
Radios made in Nanjing are as good as those made in Shanghai.
3、电话用语中，常用this介绍自己，用that询问对方
Hello,this is Jim.Is that Tom?(我是基姆，你是汤姆吗?)
五、疑问代词(who,whom,whose,what,which)
1、who作主语时，即使被问者是复数，通常也用单数谓语动词;which作主语时，动词的单复数要和后面的人或物保持一致。
--Who _(be)coming to dinner tonight?--Sunny,Funny and Money
--Who _(want)to come with me?--We do.
--Which _(be)valuable,health or wealth?(哪一样更可贵，健康还是财富?)
--Which _(be)prettier,these or those?(哪些更漂亮，这些还是那些?)
2、what所指的范围是无限的，而which则指在一定的范围内
Which girls do you like best?(你最喜欢哪几个姑娘?)
What girls do you like best?(你最喜欢什么样的姑娘?)
3、whom是who的宾格，作动词或介词宾语，可用代替;whose要后跟名词。
Who/Whom are you taking the book to?
Whose sister is adoctor?
