指示代词：
this，that，these，those
这个，那个，这些，那些
注意：
this , that 是单数，做主语时谓语动词变成第三人称单数形式
these，those是复数。
用法：
1）this和these表示在时间或空间上较近的人或物，that和those表示在时间或空间上较远的人或物：
例：
1.This is a book , and that is a folder.
2.These are some books , and those are some folders.
2）this，that，these，those在做主语或宾语时没有形式上的变化：
例：
1.I like this , but I don't like that.
2.I want these , but I don't want those.
3）承上启下：
that和those可以指前文中的事物，this和these可以指下文中将要讲到的事物。
例：
1.This is what I will do.
I will apologize first . And then ask for help.
2.I got up late , that's why I missed the bus.
4）限定名词：
this，that，these，those可以代替名词，也可以限定名词，和名词组合在一起做主语/宾语：
例：
This is Mary.代替名词
This girl is Mary.限定名词
Those are my teachers.代替名词
Those men are my teachers.限定名词
this/that的特殊用法：
1）泛指虚指：
例：
A：What are you doing now?
B：This and that.
2）this，that做副词，表示这么，那么：
例：
A：This candy is delicious.
B：Yeah , it's this good. You don't even want to finish it.
I thought it was good. But I never know it is that good.
作业：
翻译：
1.这是我的猫。
This is my cat.
2.这只猫真可爱。
This cat is so cute.
3.我知道那个。
I know that.
4.我知道那个东西。
I know that thing.
5.这些是我的书，那些是Tommy的书。
These are my books , and those are Tommy's books.
6.我的生日蛋糕有这么大。
My birthday cake is this big.
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