（1）一般说来，先行词是all, anything, everything, nothing, much, little,
That’s all (that) I know.
Everything that can be done is done.
（2）先行词之前有all, any, every, no, little, much, only, very等修饰时，关系代词应用that。如：
He’ll read all the books that are sold here.
Ask any questions (that) you don’t understand.
Who is the man that is shouting there?
It’s a song that is very popular.
My hometown is no longer the place that it used to be.
She is not the girl that she was three years ago.
Tang Guoqiang has become one of the best actors that appear on
He talked about the teachers and schools that he had visited.
There is a seat in the corner that is still free.
This is the same person that I met yesterday.
This is the same museum that you once visited.
注意：the same…that…结构中的that不能用as代替，因为the same…as…与the same…that…的含义不同。
The man who is at table is his brother that has been serving in
I’ll borrow a book which tells about the heroic deeds that the
PLA did in the battles against the invaders.
He told me to read a book that is very short, and that is very
The dog who is barking is our pet.
Those who want to go sign their names here.
The girl who danced beautifully gave us a performance that day.
Do you know the comrade who spoke at the meeting just now?
He who does no work gets no pay.
We are badly in need of those who can work in real earnest.
I have found a man who can do this work.
He is a man who should learn from others.
There is someone outside the office who wants to see you.
There’s a man who lives in that village.
（6）不定代词one, ones, anyone等作先行词时，多用who。如：
One who works without complain is welcome here.
I saw a man in the street who was surrounded by many people.
The soldiers, who may have felt sorry for the boy, had him stand
with his back to his father.
The man that I like is the one who is both competent and diligent.
I met a Greek who traveled a lot in the world, but who knew very
little about his own country.
In the dark street, there wasn’t a single person to whom she could
turn for help.
The brave man, whom the tiger was shot by, is a good hunter.
What was that which you said about him?
I have some interests outside my professional work which give
me great pleasure.
This is the book that you borrowed which you have lost.
I have a house which is located on the hillside, which faces the
I will buy a book, which tells about the use of English idioms.
We went to the nearest port which we reached safely.
He persisted in having a bicycle which he actually had no use
They had a meeting at which he spoke on the current economic situation.
This is the book (that) she was looking for.
She is working hard, as everyone can see. 或：
As everyone can see, she is working hard.
She married him, which was natural.但不能说：Which was natural,
she married him.