He often helps me.
Who is at the door? It's me.
The bicycle belongs to Tom and me.
出現并列主語或賓語時，其排列順序為：單數時是第二、第三、第一人稱(簡稱231)即you，he and I或you，her and me;復數時是第一、第二、第三人稱(簡稱123)即we，you and they或us，you and them。
2. 物主代詞：形容詞性物主代詞作定語，后加名詞;而名詞性物主代詞等于形容詞性物主代詞加名詞。如： This is my book.=This book is mine.
Your pen is blue. Mine is blue,too.
May I use your pen? I've lost mine.
She is a classmate of his.
The bike is hers.
Help yourself to some cakes.
I can look at myself in the mirror.
They should think more of the public health than themselves.
We do homework by ourselves.
I myself go to the airport to meet my uncle.
What's this(that)? It's a book.
What are these(those)? They are books.
(1)指物：It's a robot.
(2)指自然現象： It's raining now, but it will be fine soon.
(3)指時間：What time is it? It's 8 o'clock.
(4)指距離：It's twenty minutes' walk.
(5)作形式主語：It's important for us to fight pollution.
It took me half an hour to finish the work.
It's kind of you to say so.
(6)作形式賓語： We think it necessary to relax from time to time.
There are some pens on the desk.
There aren't any pens on the desk.
Are there any pens on the desk?
Some are Chinese. Others are English.