句子成分
英语的句子成分主要有六种：即主语、谓语、宾语、定语、状语和补语。（可以熟记为：主谓宾，定状补）除了这六种主要成分之外，还有“表语”和“同位语”的说法。但表语和系动词一起作谓语，因此划分成分时，划分在谓语上。同位语分为主语同位语和宾语同位语，属于主语或宾语的一部分。
主语
主语是一个句子所叙述的主体，一般位于句首，通常由名词性的词来充当。可以作主语的词性或语法结构：1.名词2.代词3.数词4.名词化的形容词（如the rich）5.不定式6.动名词7.主语从句等表示。
During the 1990s, American country music has become more and more popular.
We often speak English in class.
One-third of the students in this class are girls.
To swim in the river is a great pleasure.
Smoking does harm to the health.
The rich should help the poor.
When we are going to have an English test has not been decided.
It is necessary to master a foreign language.
That he isn’t at home is not true.
改正下列句中的错误，并说明原因。
He failed the exam is the reason why he dropped out.
That why he was late for school was that his mother was ill.
Beyond the mountains lie a small village.
Gone is the days when I had to go to school on foot.
Play basketball is my favorite sport.
Give up English is not an option.
谓语
谓语由动词充当，说明主语所做的动作或具有的特征和状态。谓语的构成如下：
简单谓语：由一个动词或动词短语构成。如：
He practices running every morning.He reads newspapers every day.
复合谓语：由情态动词或其他助动词加动词构成。如：You may keep the book for two weeks. He has caught a bad cold. My sister is crying over there.I have been waiting for you all the time.I would stay at home all day.
由系动词加表语构成。系动词不能单独作谓语，要和表语一起作谓语。如：We are students.Your idea sounds great.
表语
表语多是形容词，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。
Our teacher of English is an American.
Is it yours?
The weather has turned cold.
The speech is exciting.
Three times seven is twenty one.
His job is to teach English.
His hobbyis playing football.
The machine must be under repairs.
The truth is that he has never been abroad.
宾语
宾语由名词性的词充当，表示动作的对象或承受者，一般位于及物动词和介词后面。
宾语分为动词宾语和介词宾语，分别构成动宾结构和介词结构。
They planted many trees yesterday.
(How many dictionaries do you have?) I have five.
They helped the old with their housework yesterday.
I wanted to buy a car.
I enjoy listening to popular music.
I think（that）he is fit for his office.
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。宾语补足语和宾语构成逻辑上的主谓关系。换句话说，在意思上，宾语相当于宾补的主语。
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。
His father named him Dongming.
They painted their boat white.
Let the fresh air in.
You mustn’t force him to lend his money to you.
We saw her entering the room.
We found everything in the lab in good order.
We will soon make our city what your city is now.
I want your homework done on time.
主补
对主语的补充。含有宾语补足语的句子在变成被动语态，宾语作主语时，原来的宾补就成了主语补足语。
He was elected monitor.
She was found singing in the next room.
定语
定语是对名词或代词起修饰、限定作用的词、短语或句子，汉语中常用“……的”表示。定语通常位于被修饰的成分前。在英语中，许多情况下，定语是放在所修饰词后面的。
The next man is a scientist.
1.形容词短语作定语一般放在所修饰词之后。
The man next to me is a scientist.（我旁边的那个人）
2.副词用作定语一般要后置。
People there are very friendly. (那儿的人们)
He didn’t like the man downstairs. （楼下的那个人）
3.介词短语作定语时要后置。
The boy under the tree is Tom.（树下的那个男孩）
The tallest boy in our class is John.（我们班最高的那个男孩）
4.现在分词短语、过去分词短语、动词不定式作定语常后置。
I have something to say. (我有要说的话)
The boy crying over there is my classmate.（在那边哭的那个男孩）
The house built last year is impressive.（去年建的那座房子）
The letter on the desk is for Mr. Wu.
The woman with a baby in her arms is his mother.
We need a place twice larger than this one.
She carried a basket full of eggs.
The man downstairs was trying to sleep.
There are lots of places of interest needing repairing in our city.
Tigers belonging to meat-eating animals feed on meat.
He picked up a wallet lying on the ground on the way back home.
There are many clothes to be washed.
Most of the singers invited to the party were from America.
Then the great day came when he was to march past the palace in the team.
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，叫作状语。
He writes carefully. He walks slowly.(认真地写，慢慢地走，修饰动词用副词，作状语)
This material is environmentally friendly.（修饰形容词用副词，作状语）
He runs very slowly.（修饰副词slowly, 因此very是副词，作状语）
Unfortunately, he lost all of his money. （修饰整个句子用副词，作状语）
状语按意义分类
在句子成分中，主语、谓语、宾语、定语、表语、补语都比较好辨认，如果这几个成分都不是，那很可能就是状语了。因此，状语的种类很多，可以表示时间、地点、原因、目的、结果、程度、条件、方式和让步等。
指出下列画线部分属于什么状语。
1.How about meeting again at six?
2.Mr. Smith lives on the third floor.
3.Last nightshe didn’t go to the dance party becauseof the rain.
4.She put the eggs into the basket with great care.
5.She came in with a dictionary in her hand.
6.In order to catch up with the others, I must workharder.
7.To make his dream come true, Tom becomes very interested in business.
8.The boy needs a pen very much.
9.He was so tired that he fell asleep immediately.
10.She works very hard though she is old.
11.I shall go there if it doesn’t rain.
同位语
同位语是在名词或代词之后并列名词或代词对前者加以说明的成分，近乎于后置定语。如：
We students should study hard. / (students是we的同位语，都是指同一批“学生”）
It’s good to us students.
选择正确答案，并说出句中哪个是同位语。
1.The young man,______,works in the office.A. me brother B. my brother C. my brothers D. me
2.Our English teacher,______, often helps us with study.A. Mrs. WangB. Mrs. Wangs C. Mrs. Wang’s.D. of him
3.______, some railway workers, are busy repairing the train.A. ThemB. HeC. TheyD. Theirs
简单句的五种基本结构
英语句子的基本结构可以归纳成五种基本句型及其扩大、组合、省略或倒装。掌握这五种基本句型，是掌握各种英语句子结构的基础。
英语五种基本句型结构如下：
① Ｓ Ｖ （主＋谓）② Ｓ Ｖ Ｏ （主＋谓＋宾）③ Ｓ Ｖ ｏ Ｏ （主＋谓＋间宾＋直宾）④ Ｓ Ｖ Ｏ Ｃ （主＋谓＋宾＋宾补）⑤ Ｓ Ｖ Ｐ （主＋系＋表）
主语（subject）谓语（predicate）宾语（object）定语（attribute）状语(adverbial)补语（complement）表语（predicative）
基本句型一：Ｓ Ｖ （主＋谓）
这类句子的谓语动词都是不及物动词，都不带宾语，但可以带状语。如:
Time flies. (Ｓ Ｖ)
It is raining now. (Ｓ Ｖ)
We’ve worked for 5 hours. (Ｓ Ｖ)
分析下列句子成分，并在后面括号内标明属于五种基本句型中的哪一种。
Dark clouds hung overhead. ( )
Gradually a smile appeared on her face. ( )
He is smiling all over his face. ( )
基本句型二： Ｓ Ｖ Ｐ （主＋系＋表）
系动词主要是be，但还有一些动词有些时候也可作系动词，有人称之为半系动词。
He fell ill yesterday.
His advice proved right.
The shop stays open till 8 o’clock.
The machine went wrong.
常见的系动词
1.状态系动词：用来表示主语状态，只有be一词。如： He is a teacher. 他是一名教师。
2.持续系动词：用来表示主语继续或保持一种状况或态度，主要有keep, remain, stay, lie, stand。如：He kept silent at the meeting. 他开会时保持沉默。 This matter remains a mystery. 此事仍是一个谜。The food stays fresh in the fridge.食物在冰箱里仍然很新鲜。The house stood empty for years.房子空了数年。He lies awake in bed.他躺在床上，醒着。
3.表“像”系动词：用来表示“看起来像”这一概念，主要有seem, appear, look。如：Something seems wrong. 好像出差错了。He appears young. 他看起来很年轻。
4.感官系动词：主要有look“看起来”，feel“摸起来”, smell“闻起来”, sound“听起来”, taste“尝起来”。This kind of cloth feels very soft. 这种布手感很软。This flower smells very sweet. 这朵花闻起来很香。
5.变化系动词：表示主语变成什么样。变化系动词主要有become, grow, turn, fall, get, go, come, run。He became mad after that. 自那之后，他疯了。She grew rich within a short time. 她没多长时间就富了。He fell ill yesterday.他昨天病了。Eggs go bad easily in summer.蛋夏天容易变坏。His face went red.他的脸变红了。What he had dreamt of came true.他的梦想实现了。Still waters run deep.静水流深。
6.终止系动词：表示主语已终止动作，主要有prove, turn out, 表达“证实”，“变成”之意。如：The rumor proved false. 这谣言证实有假。His plan turned out a success. 他的计划终于成功了。（turn out表终止性结果）What he predicted turned out (to be) wrong.他预言的结果是错的。
用下画线画出下列句中的系动词。
His advice proved right.
The shop stays open till 8 o’clock.
The machine went wrong.
All these efforts seem in vain.
Trees turn green in spring.
What you said sounds great.
系动词不能单独作谓语，要和表语一起作谓语
He is a student. (Ｓ Ｖ Ｐ)
Your idea sounds great. (Ｓ Ｖ Ｐ)
在一个英语单句中，一般情况要有谓语动词
要注意：介词短语和形容词不能单独作谓语，要和系动词一起作谓语。
改错：
①Our school very beautiful and we like it very much.
②Your book on the desk.
基本句型三： Ｓ Ｖ Ｏ （主＋谓＋宾）
此结构是由“主语+及物动词（词组）+宾语”构成。如：
She likes English.
We planted a lot of trees on the farm yesterday.
用下画线画出下列句中的宾语。
People all over the world speak English.
Jim cannot dress himself.
All of us believe that Jack is an honest boy.
He did not know what to say.
He just wanted to stay at home.
He practices speaking English every day.
基本句型四： Ｓ Ｖ ｏ Ｏ （主＋谓＋间宾＋直宾）
有些及物动词可以有两个宾语，如：give“给”，pass“递”，bring“带”，show“显示”。这两个宾语通常一个指人，为间接宾语；一个指物，为直接宾语。间接宾语一般位于直接宾语之前。
一般的顺序为：动词 + 间接宾语 + 直接宾语。
如：He gave me a cup of tea. (Ｓ Ｖ ｏ Ｏ)
强调间接宾语顺序为：动词 + 直接宾语 +介词+ 间接宾语。如：He gave a cup of tea to me..
常跟双宾语的及物动词有：
（需借助to的）allow, bring, deny, give, grant, hand, leave, lend, offer, owe, pass, pay, permit, promise, read, refuse, sell, send, show, teach, tell, wish, write等。
（需借助for 的） buy, choose, fetch, get, make, order, paint, play(演奏), save, sing, spare等。
一般用to多些，用for的记住常用的三个就行：get, buy, make。
He sent me an English-Chinese Dictionary.
= He sent an English-Chinese Dictionary to me.
She bought John a book. = She bought a book for John.
分析下列句子成分，说出间接宾语和直接宾语。
She ordered herself a new dress.
She cooked her husband a delicious meal.
He brought you a dictionary.
He denies her nothing.
基本句型五：ＳＶＯＣ （主＋谓＋宾＋宾补）
此句型的句子特点是：动词虽然是及物动词，但是只跟一个宾语还不能表达完整的意思，必须加上一个补充成分来补足宾语，才能使意思完整。
宾语补足语：位于宾语之后对宾语做出说明的成分。宾语与其补足语有逻辑上的主谓关系，它们一起构成复合宾语。
The war made him a soldier.（ＳＶＯＣ“他成为一个士兵”，构成逻辑上的主谓关系）
New methods make the job easy. （ＳＶＯＣ）
I often find him at work. （ＳＶＯＣ）
I saw a cat running across the road.
分析下列句子并划分成分，在后面的括号内标明是什么充当句子的宾语补足语。
1. They appointed him manager. （ ）
2. They painted the door green. （ ）
3. He pushed the door open. （ ）
4. They found the house deserted. （ ）
5. What makes him think so? （ ）
6. We saw him out. （ ）
7. He asked me to come back soon. （ ）
8. I saw them getting on the bus. （ ）
there be 句型
此句型是由“there + be + 主语 + 状语”构成，用以表达“存在有”。它其实是倒装的一种情况，主语位于谓语动词 be 之后，there 仅为引导词（也有看作形式主语的），并无实际意义。
be 与其后的主语在人称和数上一致，有时态和数的变化。可用 live, stand, come, go, lie, remain, exist, arrive等词代替be动词。表示存在有，但表意要更具体一些。如：
There is a book and two pens on the desk.
There are two pens and a book on the desk.
There lived an old man at the foot of the mountain.There came a shout for “help”.There exists no air on the moon.There lies a book on the desk. There stands a tree on the hill.
1.______a certain doubt among the students as to the necessity of the work.A. It existedB. There existed C. They hadD. There had
2.______ a beautiful palace ______ the foot of the hill.A. There stand; atB. There stands; under C. Stands there; underD. There stands; at
答案：B, D
there be 与have 的区别
there be …“某地有某物，某时有某事”；have 表示“某人拥有某物”。
改错：
There has a book on the desk.
There will have a meeting this evening.
答案：①把has改为is; ②把have改为be。提示：没有there have这种表示“有”的方法。
I’ll have my bike repaired.
These words sound reasonable.
He showed me how to run the machine.
I gave my car a wash.
We all think it a pity that she didn’t come here.
He talked loudly in the classroom yesterday.
The room soon became crowded.
Don’t keep the lights burning.
I showed him my pictures.
I told him that the bus was late.
We elected him monitor.
I did well in English.
The days are getting longer and longer.
简单句、并列句和复合句
英语的句子种类主要包括简单句、并列句和复合句。简单句是并列句和复合句的构成基础。
简单句、并列句和复合句的基本形式：
简单句：主语＋谓语
并列句：简单句A＋并列连词(and/so/but etc)＋简单句B
复合句：主句(简单句A)＋从句 (含有引导词的简单句B)或从句 (含有引导词的简单句B)＋主句(简单句A)
如：
One must show honor to one's parents.(简单句)
Alice was honest with her master and she did all the things honestly for him.(并列句)
Everyone knows that Yao Ming is a known basketball player.(复合句)
谓语动词
谓语是英语句子中的核心成分，谓语主要由动词来充当，它有时态和语态的变化。两个或两个以上动词构成并列谓语，要在后两个谓语动词之间加上适当的连词(如：and/so/but)。
练习：
A．请判断下列是不是句子(“是”用“√”表示，“不是”用“×”表示)。
( )1.There was a pretty toy on the table.
( )2.It being a goodlooking clever dog.
( )3.He be about to tell us the fact.
( )4.Because of his coming late.
( )5.Book me a single room.
B．请判断下列句子是对还是错，对的打“√”，如错，请改正。
1．Seen from the top of the mountain, and the city looks quite small.
2．The weather is fine, we'll go out for a picnic.
3．He has three sons, but none of them takes good care of him.
4．There are 5 teachers will go with us.
5．This is your last chance, so taking hold of it.
6．If you are quick enough, you can catch the last bus to the town.
7．China will make greater and greater progress, this is known to us all.
8．I drop in on you tonight.
9．He didn't pass the exam made his parents very angry.
10．I wish him write me a letter soon.
简单句
只有一个主语(或并列主语)和一个谓语(或并列谓语)。如：
He often reads English in the morning.Tom and Mike are American boys.She likes drawing and often draws pictures for the wall newspapers.
（画线部分为并列谓语，只有一个主语，仍为简单句。）
并列句
由并列连词（and, but, or等）或分号（;）把两个或两个以上的简单句连在一起构成。要注意,逗号是不可以连接句子的，这一点和汉语不同。如：
You help him and he helps you.The future is bright; the road is tortuous. 前途是光明的，道路是曲折的。
●表示连接两个同等概念，常用and, not only…but also…, neither…nor…等连接。 The teacher’s name is Smith, and the student’s name is John.He not only stole my money, but he also took my watch away.
●表示选择，常用的连词有or, either…or…, otherwise等。Hurry up, or you’ll miss the train.
●表示转折，常用的连词有but, still, however, yet, while, when等。He was a little man with thick glasses, but he had a strange way of making his classes lively and interesting.
●表示因果关系，常用的连词有so, for, therefore等。August is the time of the year for rice harvest, so every day I work from dawn until dark.
复合句
复合句含有两个或两个以上主谓结构，其中一个主谓结构作另一个的成分。（而并列句的两个主谓结构间是并列关系， 而不是从属关系。）
当简单句的一个成分从词或词组变为句子时，整个句子就成为复合句了。
1.It is wrong.
What he said is wrong.2.The boy over there is my brother.
The boy who is wearing a hat is my brother.3.I was doing my homework at six.
I was doing my homework when he came in.从上面这几个句子，我们可以看出：
一个句子如果含有从句，如名词性从句（主语从句、宾语从句、表语从句和同位语从句）、定语从句和状语从句等，这个句子就是复合句。
复合句的从句和主句之间要用连接词连接。
判断下列句子是简单句、并列句还是复合句。
We often study Chinese history on Friday afternoon.
The boy who offered me his seat is called Tom.
There is a chair in this room, isn’t there?
My brother and I go to school at half past seven in the morning and come back home at seven in the evening.
He is in Class One and I am in Class Two.
He was fond of drawing when he was yet a child.
Neither has he changed his mind, nor will he do so.
What he said at the meeting is very important, isn’t it?
The farmer is showing the boy how to plant a tree.
Both Tom and Jack enjoy country music.
Right now it is the summer vacation and I’m helping my Dad on the farm.
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.
Although the farm is large, my Dad has only two men working for him.
引导的是什么从句，不仅要根据连词，还要根据句子结构和句意来判别
说出下列复合句中，where引导的是什么从句。
You can find it where you left it.（ ）
Tell me the address where he lives.（ ）
I don’t know where he comes from.（ ）
Where he was born is not known yet.（ ）
This place is where they once lived.（ ）
一个句子有两个主谓结构时，要考虑它们之间的连接问题
一个句子如果出现两个主谓结构，那它就不是简单句了，要么是并列句，要么是复合句。这时我们就要考虑连接词的问题。直接用逗号连接的两个简单句是错误的。这时，我们有四种方法来改正这个错句：
改为并列句：我们可以使用and, so, but等并列连词来把它们连接起来。
改为复合句：加上从属连词，把其中的一个分句改为状语从句、定语从句或名词性从句。
改为简单句：把其中的一个主谓结构的谓语破坏掉，从而使其变成独立主格结构。改标点：把逗号改为分号（根据句意有时也可用冒号、破折号等）。
I like English, my English is very good.×I like English and my English is very good.√（并列句）As I like English, my English is very good. √（含有原因状语从句的复合句）I like English; my English is good. √（用分号）I liking English, my English is very good. √(把一个分句改为独立主格结构)
I have a house, its windows are very big. ×I have a house and its windows are very big. √ (并列句)I have a house, whose windows are very big. √ (含有定语从句的复合句)I have a house; its windows are big. √ (用分号)利用英语句子结构规律做下列各题。
Five people won the“China’s green figure” award, a title______ to ordinary people for their contributions to environmental protection.A. is givenB.was given C.being givenD.given
All the preparations for the task______, and we’re ready to start. A. completedB. complete C. had been completedD. have been completed
【2006辽宁】I was told that there were about 50 foreign students______ Chinese in the school, most______ were from Germany. A.study; of whomB.study; of them C.studying; of themD.studying; of whom
Everywhere you can see people in their holiday dress, ______ with smiles.A. their faces are shiningB. whose faces shiningC. their faces shiningD. faces shining whose
Many students______ around, I explained the story into details.A. stoodB. standing C. to standD. were standing
I have five friends, some of______ are businessmen.A. thatB. whomC. theyD. them
I have five friends, but none of______ are business- men.A. thatB. whomC. theyD. them
【2013上海】________ at the photos, illustrations, title and headings and you can guess what the reading is about.A. To lookB. LookingC. Having lookedD. Look
及物动词(vt)和不及物动词(vi)
及物动词：实义动词后面跟宾语时，动词为vt。
不及物动词:实义动词后面不跟宾语时，动词为vi。
The door opened. (open后面没跟宾语，此时，open是不及物动词。)He opened the door.(open后面有宾语the door, 此时，open是及物动词。)
注意：英语中一个动词是及物动词还是不及物动词，关键是看它用在句中时后面是否跟宾语。
注意：
1.有些动词既可作及物动词又可作不及物动词，词义相同。如：The meeting began at six. < vi.>We began the meeting at six. < vt.>
2.有些动词既可作及物动词又可作不及物动词，但词义不同。如：The man walked away.(walk不及物动词，意为“走”)He walked the dog every day.( walk及物动词，“遛”)She washes clothes at home. (wash及物动词，“洗”)The clothes washes well.(wash不及物动词，“耐洗”)
3.英语中一些单词是及物还是不及物，可能与汉语不同。He listens to the music every day.(listen为不及物动词，而汉语中“听”是及物动词。)
指出下列句中斜体动词是及物动词还是不及物动词，及物动词填vt.，不及物填vi.。
Most birds can fly.（ ）
The children are flying kites in the park. ( )
It happened yesterday.（ ）
My watch stopped.（ ）
The baby stopped crying when he saw his mother. ( )
She spoke at the meeting this morning. （ ）
Shall I begin at once?（ ）
She began working as a teacher after she left school.（ ）（ ）
When did they leave Beijing?（ ）
They left last week. （ ）
实义动词、助动词与情态动词
实义动词
指的是那些意义完全且能够独立作谓语的动词。如：He lives quite near. (live“住”，有明确的意义，单独作谓语，为实义动词。)I like reading. （like “喜欢”，意思明确，单独作谓语，为实义动词。）I bought a pen yesterday. （bought “买”，意义明确，单独作谓语，为实义动词。）
助动词
助动词的“助”是“帮助”之意。因此，助动词是指那些用来帮助构成时态、语态、虚拟语气、疑问句、否定句、倒装句和帮助强调的词。这些词本身无词汇意义或意义不完全，不能单独作谓语。
Does he like English? (does帮助构成一般疑问句，没有具体意义，是助动词。)He doesn’t have lunch at home. (does只是帮助构成否定句，没有具体意义，是助动词。)The boy is crying.(is 用来帮助构成现在进行时，和crying一起作谓语，是助动词。)He has arrived. (has用来帮助构成现在完成时，和arrived一起作谓语，是助动词。，I have been painting all day. （have been用来帮助构成现在完成进行时，和painting一起作谓语，都是助动词。）Trees are planted in spring. (are帮助构成被动语态，没有具体意义，是助动词。)The house has been pulled down. (has been帮助构成时态和语态，是助动词。)He did come yesterday. (他昨天确实来过。did起强调作用，没有具体意义，是助动词。)If he had come yesterday, I wouldn’t have made such a mistake.(had, have帮助构成虚拟语气，是助动词，属于谓语的一部分。)So did he love his mother that he bought her many presents on her birthday.(他如此爱他的母亲以至于他母亲生日那一天，他给她买了许多礼物。did只是帮助构成倒装句，没有具体意义，是助动词。)
因此可以看出，常见的助动词为do, be, have，它们为基本助动词。
一个词既可以作实义动词也可以作助动词，具体是哪一种，主要看它们在句中的功能。
He did his homework at seven o’clock.(did单独作谓语，意为“做”，是实义动词。)Did he do his homework yesterday? (did是助动词，帮助构成一般疑问句，do是实义动词，意为“做”，是实义动词。)
He has had breakfast. (has是助动词，帮助构成现在完成时，had是实义动词，意为“吃”。has had一起构成了句子的谓语。)
指出下列斜体单词是实义动词还是助动词。
Does ( ) he like ( ) swimming?
He does ( ) like ( ) swimming.
Where does( ) he live ( )?
He does ( ) some washing after work.
He has ( ) had ( )supper already.
The bridge has( ) been( ) built( ) now.
I have ( ) been ( )waiting( ) for you all day.
He was ( ) struck ( )by a stone.
人称和数的变化
先看下列三组句中have、do和be的变化形式
I have a bookHe has a book.They have a book.
I enjoy watching TV.You enjoy watching TV.We enjoy watching TV.
He is sleeping.I am sleeping.They are sleeping.
“人称的变化”是指：谓语动词用什么形式，受前面主语是第几人称的影响。主语同为单数（表示一个人）， be在第一人称I后用am, 在you后用are, 在he后用is; do和have在一、二人称后用原形，在第三人称后用为does, has。
“数”是指“单数和复数”。“数的变化”是指谓语动词用什么形式，还受前面主语是单数还是复数的影响。如果主语是复数，be要用are的形式，do和have用原形。如果主语是第三人称单数，be用is, do和have要用does和has。
情态动词
情态动词同助动词一样，不能单独作谓语，要和实义动词一起作谓语。情态动词同基本助动词的区别在于，基本助动词本身无意义，而情态动词有自己的意义。如：
He can swim across the river.(can的词义为“能够”)You must stay at home. (must词义为“必须”)
I might leave tomorrow.（might的词义为“或许”）
情态动词没有人称和数的变化。如：
He/I/We can swim.
谓语和非谓语
在英语中，一个主谓结构中只能有一个谓语，再出现动词时，要变成非谓语形式，即：在前面加to构成动词不定式（目的/将来），或在后面加-ing构成动名词或现在分词（主动），或在后面加-ed构成过去分词（被动）。也就是说，非谓语是指：动词不定式、动名词、现在分词和过去分词。
主动关系和被动关系
先看下面两个题：
______ wonderful, this kind of food enjoyed a good sale.A. TastedB. Being tastedC. TastingD. Having tasted
The food______ delicious sells well.A. smellsB. smelledC. smellingD. is smelling
一些同学分别选A和B。他们说，食物是被品尝、被闻的，和食物构成被动关系，所以要用过去分词。
这种说法是错误的。非谓语中的主动关系和被动关系，不是从谁做了这个动作着眼，而是从恢复成一句话后是“主动语态”还是“被动语态”着眼。
主动关系：从逻辑关系上看，相当于主动语态。如：The boy crying over there is Tom.(在那边哭的那个男孩) 从逻辑上讲，the boy…cry, 男孩哭，相当于主动语态，是主动关系。
被动关系：从逻辑关系上看，相当于被动语态。如：The house built last year is the strongest.(去年建的那座房子) 从逻辑上讲，the house was built,房子被建，相当于被动语态，是被动关系。
在上两题中，逻辑关系可以表达为：This kind of food tasted wonderful. The food smells delicious. 逻辑上food和taste、smell是一种主谓关系，是主动语态，因此填现在分词。
因此，上两题的答案为C和C。
先找出句中的谓语，然后改正句中的错误，并说明原因。
Get up early is good for our health.早起有利于我们的身体健康。
I want go home now.我现在想回家。
My favorite sport is play football.我最喜爱的运动是踢足球。
There is a bird sings in the tree.有一只鸟正在树上唱歌。
The boy sits over there likes singing.坐在那边的那个男孩喜欢唱歌。
The house was built last year has been sold out.去年建的那座房子已经出售了。
The girls are singing over there are my classmates.在那边唱歌的那些女孩是我的同学。
My parents wanted him work hard.我父母亲想让他努力学习。
I remember saw him that day.我记得那天看见过他。
10. I saw him walked into the building.
我看到他跑进那座建筑物。
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