主谓一致
主谓一致指的是主语和位于动词在“数”的方面一定要保持一致，而这种一致关系通常是由下列三种原则支配的
一、语法一致：主语是单数形式或不可数名词，谓语动词也用单数形式；主语用复数形式，位于也用复数形式。
The library does not open until nine o’clock.The Great Wall draws numbers of tourists every year.The best reward I get from teaching is the joy of seeing my students grow and develop.Practice is the sole criterion for testing truth.
二、意义一致原则：主语虽在语法形式上是复数形式，但意义上是单数，谓语动词也要用单数；主语虽在语法形式上不是复数形式，但意义上时复数，谓语动词也要用复数。 Cattle are grazing peacefully on the pasture.The police have arrested a lot of suspects.Two miles is a long walk for the 80-year-old man.One thousand dollars is a large sum of money for the couple.Five pounds is enough.Twenty years is a long time on one’s life.
三、就近原则：有时谓语动词的形式是和它最近的词（或词组）保持一致的。 Neither you nor I am right.Not only the boy but also his parents enjoy playing that game.Twenty percent of students are from Wuhan.Only half of the members agree with him.易出现问题的地方：
一、集体名词与以“s”结尾的名词作主语时主谓一致 1.people, cattle, police, poultry, militia, youth等形式上是单数，但意义上时复数，所以谓语用复数。
The police are questioning him.People often hear him telling about his experience in the Second World War.The militia are determined to fight the enemy to the finish.2.audience, committee, family, government, group, staff, team, public, cla, crew, arm等若表示整体概念，谓语动词用单数，若强调成员或个体，谓语动词用复数。 His family are proud of him.His family is not very large.The audience burst into thunderous applause.A large audience was watching their performance.某些表示疾病的词，如mumps, arthritis, bronchitis, rickets, diabetes等，以及某些表示游戏的词，如cards, ninepins, darts, bowls, marbles, billiards, chequers等，它们在形式上虽然是复数，但在意义上是单数，因此谓语动词要用单数。 Sometimes mumps is rather dangerous.Arthritis is not a kind of infectious disease.Marbles is greatly enjoyed by the children here.Diabetes is a kind of chronic disease.4.某些以- ics 结尾的表示学科的词，如physics, mathematics, economics, politics, linguistics, optics, electronics, acoustics等，形式上是复数形式，但意义上是单数，因此谓语动词要用单数。
Some students say physics is much more interesting than mathematics.I don’t think linguistics is difficult to learn.
但当这些词不表示“学科”时，有时可当复数用，谓语动词也要用复数。
Statistics show that the divorce rate in China is much higher than ten years ago.Politics have never interested her.5.以“s”结尾的国家、组织、机构等虽然形式上是复数，但却表示单数意义，所以谓语动词要用单数形式。
Some people say the United States is a large “melting pot”.The United Nations was founded on October 24, 1945.但表示群岛、瀑布、山脉等以“s”结尾的专有名词常被看成是复数，谓语动词也要用复数。 The Niagara Falls attracts tourists from many countries every year.The Rocky Mountains are vast and spectacular.6.某些表示由两部分组成的物体的名词在形式和意义上都是复数如：sciors, pants, trousers, shorts, glaes, spectacles, jeans等，谓语动词也用复数。 His glaes were broken this morning.Your trousers are in the wardrobe.另外还有一些常以“s”结尾的词，如：contents, archives, arms, goods, suburbs, stairs, earnings, surroundings, belongings, particulars等也通常被看成是复数，作主语时谓语也用复数形式。
The suburbs are more and more seriously polluted.The surroundings are very beautiful.All his belongings are in that big bag.
二、表示数量概念的名词（或词组）作主语时主谓一致
1.表示时间、距离、价值、重量等的名词或词组作主语时，常把这些数量看成一个整体，谓语动词用单数形式。
Seven months is needed to translate this book into Chinese.Five hundred miles is a long distance.Where is the ten dollars I gave you yesterday? 2.“分数或百分数+of„”构成的短语作主语，如果of后面是单数，谓语动词用单数；如果of后面是复数，谓语动词要用复数。 Two-thirds of the gasoline has been used.Over forty percent of the employees are women.Ninety percent of the wasteland has been turned into rice fields.Three-fifths of the trees have been cut down.3.“all(half, most, some, the rest, none等）+of„”构成的短语作主语，如果of后面是复数，谓语动词用复数；如果of后面是单数，谓语动词也用单数。 All of his energy has been used up.All of the restaurants are closed.Most of the oil is imported from Saudi Arabian.Most of the rubbish has been removed from the playground.4.“lots（plenty, heaps, loads, scads等）+of„”构成的短语作主语时，如果of 后gender是复数，谓语动词也用复数；如果of后跟的是不可数名词单数，谓语动词用单数 Plenty of time has been spent on this experiment.Loads of friends have come to attend his wedding.Scads of money has been wasted in the past 2 years.5.当“many a+名词”或“more than one+名词”作主语时，谓语动词用单数。 Many a customer complains about the poor quality of the washing machines.More than one train was delayed.6.“a portion(series, pile, panel, kind, sort, type等)+of+名词”构成的短语作主语，谓语动词用单数（无论名词时单数还是复数）。 A portion of the products is being inspected.A series of questions was asked by the students.A pile of reference books is on his desk.7.“a number(或numbers)of +可数名词复数”作主语时，谓语用复数形式，但a great deal（an amount, a quantity)of +不可数名词单数作主语时，谓语动词用单数形式。 A large number of workers were dismied.Numbers of houses were destroyed.A great deal of time has been wasted.但the number of „作主语时，谓语动词要用单数形式 The number of students is increasing.8.“an average(或total)of +名词复数”构成的短语作主语，谓语动词一般用复数。 An average of 500 students graduate from this school every year.A total of 200 bicycles were sold last month.但the average（或total)of +名词复数作主语时谓语要用单数形式
The average of students who graduate from this school every year is 500.9.“a group(crowd, gang, flock, herd)of +可数名词复数”构成的短语作主语时，谓语动词既可以单数也可以用复数。
A group of people was /were standing under the big tree.A gang of gunmen was/were robbing the jeweler\'s.A herd of cows was/were grazing there.
三、并列结构作主语时主谓一致
1.由and或both„and„连接的并列结构作主语，如果意义为单数，谓语动词就用单数；如果意义为复数，谓语动词就要用复数。
Asia, Africa and Latin America make up the third world.Both families and society are responsible for juvenile delinquency.下面由and连接的并列结构表面上是复数，实际上表示复数意义，所以谓语动词要用复数。 Chinese and America culture are quite different.What they have said and done are quite disappointing.当each„and each„, every„and every„, no„and no„作主语时，谓语动词要用单数形式
Each boy and each girl was given an apple.Every teacher and every student was looking at him.No bus and no taxi was found in the street.2.由or, either..or„, neither„nor„, not only„but also„连接的并列结构作主语时，谓语动词的单复数形式与离它最近的主语保持一致。 Neither he nor I am able to get there in ten minutes.Not only he but also I am curious about this.Neither her husband nor the doctors have told her about her condition.3.由某些介词或准并列连词连接的短语作主语，谓语动词的形式应与真正的主语保持一致。
常见的这类介词有：with, along with, together with, besides, in addition to, except, but, like, including等，准并列连词有：as well as, as much as, no le than, more than, rather than等。
Practical experience as well as formal education is considered very important in today’s job market.
No one except hi relatives helps him.The bus driver, as much as the paengers, was very impatient.Jack, like many other children, often dreams of travelling in the space.The school, rather than the parents, is mainly responsible for the children’s safety.
四、动名词、不定式和短语作主语时主谓一致
动名词或不定式短语作主语，谓语动词一般用单数形式。 To err is human.To learn three foreign languages at the same time is very difficult.Smoking is very harmful to one’s health.Walking is the easiest way to exercise.
五、名词性从句作主语时主谓一致 名词性从句作主语，谓语动词通常用单数
Whether you go or not makes no difference to me.It’s quite obvious that they have nor received the letter.How the plan is to be carried out still needs to be discued.
六、there be„ 句型中的主谓一致
be 动词的形式由它后面的主语决定，但当be 动词后是并列结构作主语时，遵循就近原则，be动词的形式要与它最近的主语保持一致。 There are servants in the house.There is no water on the moon.There are a lot of spectators in the stadium.
七、定语从句中的主谓一致
定语从句中谓语动词的单、复数形式是由先行词所决定的。 That’s the young man who comes to the library every week.Yesterday they visited the palaces which were built 200 years ago.在one of+名词复数+定语从句的句型中，定语从句的谓语动词通常用复数形式，但当one 前有the或the only 时，谓语动词用单数：
She is one of the few paengers who were not killed in the crash.This is the only one of the books which is worth reading.
