（一）句子成分的定义：
构成句子的各个部分叫做句子成分，语法复习一：句子成分；简单句、并列句和复合句。句子成分有主要成分和次要成分；主要成分有主语和谓语；次要成分有表语、宾语、定语、状语、补足语和同位语。
（二）主语：
主语是一个句子所叙述的主体，一般位于句首。但在there be结构、疑问句（当主语不疑问词时）和倒装句中，主语位于谓语、助动词或情态动词后面。主语可由名词、代词、数词、不定式、动名词、名词化的形容词和主语从句等表示。例如：
During the 1990s, American country music has become more and more popular.（名词）
We often speak English in class.（代词）
One-third of the students in this class are girls.（数词）
To swim in the river is a great pleasure.（不定式）
Smoking does harm to the health.（动名词）
The rich should help the poor.（名词化的形容词）
When we are going to have an English test has not been decided.（主语从句）
It is necessary to master a foreign language.（it作形式主语，真正的主语为后面的不定式）
（三）谓语：
谓语说明主语所做的动作或具有的特征和状态。动词在句中作谓语，一般放在主语之后。谓语的构成如下：
1、简单谓语：由一个动词或动词短语构成。如：He practices running every morning.
2、复合谓语：（1）由情态动词或其他助动词加动词原形构成。如：You may keep the book for two weeks. He has caught a bad cold. （2）由系动词加表语构成。如：We are students.
（四）表语：
表语用以说明主语的身份、特征和状态，它一般位于系动词（如be, become, get, look, grow, turn, seem等）之后。表语一般由名词、代词、形容词、分词、数词、不定式、动名词、介词短语、副词及表语从句表示。例如：
Our teacher of English is an American.（名词）
Is it yours?（代词）
The weather has turned cold.（形容词）
The speech is exciting.（分词）
Three times seven is twenty one?（数词）
His job is to teach English.（不定式）
His hobby（爱好）is playing football.（动名词）
The machine must be out of order.（介词短语）
Time is up. The class is over.（副词）
The truth is that he has never been abroad.（表语从句）
（五）宾语：
宾语表示动作的对象或承爱者，一般位于及物动词和介词后面。例如：
They went to see an exhibition（展览）yesterday.（名词）
The heavy rain prevented me form coming to school on time.（代词）
How many dictionaries do you have? I have five.（数词）
They helped the old with their housework yesterday.（名词化形容词）
He pretended not to see me.（不定式短语）
I enjoy listening to popular music.（动名词短语）
I think（that）he is fit for his office.（宾语从句）
宾语种类：（1）双宾语（间接宾语+直接宾语），例如：Lend me your dictionary, please.（2）复合宾语（宾语+宾补），例如：They elected him their monitor.
（六）宾语补足语：
英语中有些及物动词，除有一个直接宾语以外，还要有一个宾语补语，才能使句子的意义完整。带有宾语补足语的一般句型为：某些及物动词（如make等+宾语+宾补）。宾补可由名词、形容词、副词、不定式、分词、介词短语和从句充当。例如：
His father named him Dongming.（名词）
They painted their boat white.（形容词）
Let the fresh air in.（副词）
You mustn't force him to lend his money to you.（不定式短语）
We saw her entering the room.（现在分词）
We found everything in the lab in good order.（介词短语）
We will soon make our city what your city is now.（从句）
（七）定语：
修饰名词或代词的词、短语或从句称为定语。定语可由以下等成分表示：
Guilin is a beautiful city.（形容词）
China is a developing country; America is a developed country.（分词）
There are thirty women teachers is our school.（名词）
His rapid progress in English made us surprised.（代词）
Our monitor is always the first to enter the classroom.（不定式短语）
The teaching plan for next term has been worked out.（动名词）
He is reading an article about how to learn English.（介词短语）
（八）状语：
修饰动词、形容词、副词或整个句子，说明动作或状态特征的句子成分，叫做状语。可由以下形式表示：
Light travels most quickly.（副词及副词性词组）
He has lived in the city for ten years.（介词短语）
He is proud to have passed the national college entrance examination.（不定式短语）
He is in the room making a model plane.（分词短语）
Wait a minute.（名词）
Once you begin, you must continue.（状语从句）
状语种类如下：
How about meeting again at six?（时间状语）
Last night she didn't go to the dance party because of the rain.（原因状语）
I shall go there if it doesn't rain.（条件状语）
Mr Smith lives on the third floor.（地点状语）
She put the eggs into the basket with great care.（方式状语）
She came in with a dictionary in her hand.（伴随状语）
In order to catch up with the others, I must work harder.（目的状语）
He was so tired that he fell asleep immediately.（结果状语）
She works very hard though she is old.（让步状语）
I am taller than he is.（比较状语）
练习
一、指出下列句子划线部分是什么句子成分：
1. The students got on the school bus.
2. He handed me the newspaper.
3. I shall answer your question after class.
4. What a beautiful Chinese painting!
5. They went hunting together early in the morning.
6. His job is to train swimmers.
7. He took many photos of the palaces in Beijing.
8. There is going to be an American film tonight.
9. He is to leave for Shanghai tomorrow.
10. His wish is to become a scientist.
11. He managed to finish the work in time.
12. Tom came to ask me for advice.
13. He found it important to master English.
14. Do you have anything else to say?
15. To be honest; your pronunciation is not so good.
16. Would you please tell me your address?
17. He sat there, reading a newspaper.
18. It is our duty to keep our classroom clean and tidy.
19. He noticed a man enter the room.
20. The apples tasted sweet.
二、用符号划出下列短文各句中的主语（-）、谓语（＝）、宾语（～）：
I hope you are very well. I'm fine, but tired. Right now it is the summer vacation and I'm helping my Dad on the farm. August is the hottest month here. It is the time of year for the rice harvest, so every day I work from dawn until dark. Sometimes we go on working after dark by the lights of our tractors. We grow rice in the south of the States, but in the north where it is colder they grow wheat. We have a lot of machines on the farm. Although the farm is large, my Dad has only two men working for him. But he employs more men for the harvest. My brother takes care of the vegetable garden. It doesn't often rain in the summer here. As a result, we have to water the vegetable garden. Every evening we pump water from a well. It then runs along channels to different parts of the garden.
The sun rises in the east. (名词)
He likes dancing. (代词)
Twenty years is a short time in history. (数词)
Seeing is believing. (动名词)
To see is to believe. (不定式)
What he needs is a book. (主语从句)
It is very clear that the elephant is round and tall like a tree.
(It形式主语，主语从句是真正主语)
二、谓语（predicate）:说明主语的动作、状态和特征。
We study English.
He is asleep.
三、表语（predicative）:系动词之后的成分，表示主语的性质、状态和特征。
He is a teacher. (名词)
Seventy-four! You don’t look it. (代词)
Five and five is ten. (数词)
He is asleep. (形容词)
His father is in. (副词)
The picture is on the wall. (介词短语)
My watch is gone / missing / lost. (形容词化的分词)
To wear a flower is to say “I’m poor, I can’t buy a ring. ” (不定式)
The question is whether they will come. (表语从句)
常见的系动词有: be, sound(听起来)， look(看起来)， feel(摸起来)，smell(闻起来)，
taste(尝、吃起来)， remain(保持，仍是)， feel(感觉) ….
It sounds a good idea.
The sound sounds strange.
Her voice sounds sweet.
Tom looks thin.
The food smells delicious.
The food tastes good.
The door remains open.
Now I feel tired.
四、宾语：
1)动作的承受者——动宾
I like China. (名词)
He hates you. (代词)
How many do you need? We need two. (数词)
We should help the old and the poor.
I enjoy working with you. (动名词)
I hope to see you again. (不定式)
Did you write down what he said? (宾语从句)
2)介词后的名词、代词和动名词——介宾
Are you afraid of the snake?
Under the snow, there are many rocks.
3) 双宾语——间宾(指人)和直宾(指物)
He gave me a book yesterday.
Give the poor man some money.
五、宾补：对宾语的补充，全称为宾语补足语。
We elected him monitor. (名词)
We all think it a pity that she didn’t come here. (名)
We will make them happy. (形容词)
We found nobody in. (副词)
Please make yourself at home. (介词短语)
Don’t let him do that. (省to不定式)
His father advised him to teach the lazy boy a lesson. (带to不定式)
Don’t keep the lights burning. (现在分词)
I’ll have my bike repaired. (过去分词)
六、主补：对主语的补充。
He was elected monitor.
She was found singing in the next room.
He was advised to teach the lazy boy a lesson.
七、定语：修饰或限制名词或代词的词、词组或句子。
Ai Yanling is a chemistry teacher.(名词)
He is our friend. (代词)
We belong to the third world. (数词)
He was advised to teach the lazy boy a lesson.(形容词)
The man over there is my old friend.(副词)
The woman with a baby in her arms is my sister. (介词)
The boys playing football are in Cla2. (现在分词)
The trees planted last year are growing well now. (过去分词)
I have an idea to do it well. (不定式)
You should do everything that I do. (定语从句)
八、状语：用来修饰v., adj., adv., or 句子。 表示时间、地点、原因、目的、结果、程度、条件、方式和让步。
(以下例句按上述顺序排列) I will go there tomorrow.
The meeting will be held in the meetingroom.
The meat went bad because of the hot weather.
He studies hard to learn English well.
He didn’t study hard so that he failed in the exam.
I like some of you very much.
If you study hard, you will pathe exam.
He goes to school by bike.
Though he is young, he can do it well.
英语的句子由主语部分与谓语部分组成，考研英语：语法大全(句子组成)。具体地讲，主要有下列六种句子成分：
1)主语(subject)它是句子所要说明的人或事物，是一句的主体。如I study English(我学习英语)中的I。
2)谓语动词(predicate verb)它是说明主语的动作或状态的，如I study English中的study。
3)表语(predicative)它是放在连系动词之后表示主语的身分或特征的，如I am a student(我是一个学生)中的student;Our classroom is clean(我们的教室很干净)中的clean，考研英语《考研英语：语法大全(句子组成)》。
4)宾语(object)它是表示及物动词动作的对象的，如I study English中的English。介词后面的名词或代词，叫做介词的宾语，如They don't work on Sunday(他们星期天不工作)中的Sunday，就是介词on的宾语。
5)定语(attribute)它是限定或修饰名词或代词用的，如He likes to drink co1d milk(他喜欢喝冷牛奶)中的co1d。
6)状语(adverbial)它是修饰动词、形容词、副词用的，如He works hard(他努力工作)中的hard。
[注]虚词在句子中一律不能作为句子成分。
