限定词的作用：
1）表示特指或泛指；
2）表示指代关系或所属关系；
3）表示数量。
例：
the apple.
a banana.
this chair.
my book.
three oranges.
the first question.
一、表示特指或泛指：
定冠词the表示特指，不定冠词a/an表示泛指。
例：
I had an apple and a banana this morning.
I ate the apple and I gave the banana to my sister.
二、表示指代关系：
this、that+单数名词
these、those+复数名词
例：
I love this book.
Those kids are really cute.
补充：such、what、which也是表指代关系的限定词：
例：
I don't have such problems.
What problem do you have?
Which bag is yours?
三、表所属关系：
1.形容词性物主代词做限定词：
my 我的 、our我们的
your 你们/你们的
his 他的 、her 她的 、 its它的
their 他们的
例：
This is my book .
That is his dog.
these are our books.
补充：whose也可做限定词，表所属关系：
例：
Whose book is this?
2.名词所有格做限定词：
例：
This is Lucy's dog.
It's my sister's fault.
单数名词与限定词：
单数名词在句子中不能独立做成分，必须添加限定词：
如以下例子是错误的：
This is book.
正确的句子如下：
This is a book.
This is the book.
This is my book.
This is Lucy's book.
This is one book.
Which book is yours?
What book do you want?
whose book is this ?
作业：
填空：
1.我写了一首歌。
I wrote ___song.a
2.我写的那首歌不太好。
___song I wrote isn't very good.The
3.这首歌听起来很棒。
___song sound great.This
4.你更喜欢哪首歌？
___song do you like more?Which
5.这是谁的雨伞？是我的。
___umbrella is this ?Whose
It's ___umbrella.my
