限定詞的作用：
1）表示特指或泛指；
2）表示指代關系或所屬關系；
3）表示數量。

例：

the apple.
a banana.
this chair.
my book.
three oranges.
the first question.

一、表示特指或泛指：

定冠詞the表示特指，不定冠詞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、表示指代關系：

this、that+單數名詞
these、those+復數名詞
例：

I love this book.
Those kids are really cute.

補充：such、what、which也是表指代關系的限定詞：
例：

I don't have such problems.
What problem do you have?
Which bag is yours?

三、表所屬關系：

1.形容詞性物主代詞做限定詞：

my 我的 、our我們的
your 你們/你們的
his 他的 、her 她的 、 its它的
their 他們的
例：

This is my book .
That is his dog.
these are our books.

補充：whose也可做限定詞，表所屬關系：
例：

Whose book is this?

2.名詞所有格做限定詞：

例：

This is Lucy's dog.
It's my sister's fault.

單數名詞與限定詞：

單數名詞在句子中不能獨立做成分，必須添加限定詞：
如以下例子是錯誤的：
This is book.

正確的句子如下：

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 ?

作業：
填空：
1.我寫了一首歌。
I wrote ___song.a

2.我寫的那首歌不太好。
___song I wrote isn't very good.The

3.這首歌聽起來很棒。
___song sound great.This

4.你更喜歡哪首歌？
___song do you like more?Which

5.這是誰的雨傘？是我的。
___umbrella is this ?Whose
It's ___umbrella.my