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主谓一致的原则是指，主语和谓语从语法形式上取得一致：主语是单数形式，谓语也采取单数形式；主语是复数形式，谓语亦采取复数形式
例如：
A grammar book helps you learn something about the rules of a language.
（主语是单数形式，谓语也采取单数形式）
语法书帮助你学习语言的某些规则。
Grammar books help you learn something about the rules of a language.
（主语是复数形式，谓语也采取复数形式）
主语和谓语从语法形式上取得一致的问题远不只上述的那么简单，有许多方面的情况需要去具体地对待：
#不定式、动名词、以及从句作主语时应看作单数，谓语动词用单数。例如：
Reading often means learning .读书常意味是学习。
To read English aloud every morning does you a lot of good.每天早晨朗读英语有许多好处。
What he said has been recorded .他说的话已被录音了。
## 不定代词one, every, each, everybody, everyone, one of, no one, nothing, nobody, someone, somebody, either, neither, many a 等作主语或是修饰主语时应看作单数，谓语动词用单数。例如：
Neither of my sisters likes sports .我的妹妹中没人喜欢运动。
Many a student takes a walk on campus after dinner.许多学生晚饭后常在校园里散步。
Every boy and girl shows great interest in extra-curriculum activities .每个男孩和女孩对课外活动都表现出很大的兴趣。
### 表示国家、机构、事件、作品等名称的专有名词作主语时应看作单数，谓语动词用单数。例如：
One Thousand And One Nights tells people lots of mysterious bits of folklore .
《一千零一夜》给人们讲了许多神秘的民间传说。
The United States is leading the world in science and technology .
美国常在世界科技方面领先。
The United Nations play an important role in the international affairs .
联合国在国际事务中起着重要作用。
#### a portion, a series of, a kind of, the number of等与名词构成名词短语作主语时应看作单数，谓语动词用单数。例如：
A series of high technology products has been laid out in the exhibition. 一系列高科技产品已在展览上展出。
The number of printing mistakes in some recent books often surprises people even to death.
近来一些书籍里印刷错误的数量让人吃惊得要命。
A substantial portion of the reports is missing .这些报告都没有提及实质问题。
A kind of rose in the garden smells very pleasant.这座花园里有一种玫瑰香气怡人。
##### 由some, several, both, few, many, a number of 等词修饰主语、或是由它们自身作主语时应看作复数，谓语动词用复数。另外，由and连接两个主语时，谓语一般用复数。例如：
On the seashore, some people are playing volleyball and some are lying in the sun. 海边，有些人在打排球，有些人躺着晒太阳。
Both of us are fond of watching football games .我们俩都喜欢看足球赛。
A number of will-be graduates are voluntarily going to work in the West of China. 许多即将毕业的学生打算自愿去中国西部工作。
###### 有些短语，如：a lot of, most of, any of, half of , three fifths of, eighty percent of, some of, none of, the rest of , all of等后接不可数名词、或是单数形式的名词作主语时应看作单数，谓语动词用单数；但如果后接可数名词的复数形式作主语时应看作复数，谓语动词用复数。例如：
A lot of money in the shop was stolen yesterday when the electricity was suddenly cut off. 昨天突然断电时，那家商店丢失了许多钱。
A lot of books about Investment Fund have been published recently.
最近出版了许多关于投资基金的书籍。
意义一致( Notional Concord )
这一原则是指，从意义着眼来解决主谓一致问题。有时主语形式上为单数，但意义上却是复数，那么谓语依意义也用复数形式；而有时主语形式上为复数，但意义上却是单数，那么谓语依意义亦用单数形式。
1） 当主语后面接由as well as, as much as, accompanied by, including, in addition to, more than,no less than, rather than, together with等引导的词组时，其谓语动词的形式要依主语的单复数而定。在这样的句子里，这些词所引导的词组不影响主语自身的单、复数形式，它们在句子里其实是状语。也就是说，我们完全可以将这些词组搬到句首或是放到句末去。从表面上我们也可以看出，它们与主语之间有"，"隔开。例如：
Petroleum, along with fuel gas, has recently risen in price.
最近石油和燃料煤气的价格上涨了。
The teacher, with all his students, is going to have a picnic this weekend.老师打算这个周末与学生们一起去野炊。
The students, together with their teacher , are going to have a picnic this weekend.学生们打算这个周末与他们的老师一起去野炊。
The warehouse, with all its stockings, was burned last night.
昨晚，那个仓库连同其所有的货物一起被烧毁了。
我们完全可以将上面句子中的那些词组都分别搬到句首或是放到句末去，因为它们在句子里是状语：
Petroleum has recently risen in price, along with fuel gas.
Along with fuel gas, petroleum has recently risen in price.
The students are going to have a picnic this weekend together with their teacher.
As well as the suitcase, the missing things have been found and returned to the owner.
The missing things have been found and returned to the owner, as well as the suitcase.
2) 表示时间、金钱、距离、体积、重量、面积、数字等词语作主语时，其意义若是指总量应看作单数，谓语动词用单数；但如果其意义是指"有多少数量"则应该看作是复数，那么谓语动词也应该用复数。例如：
Four weeks are often approximately regarded as one month.
人们常大约地将四个星期看成一个月。
Twenty years stands for a long period in one's life.
二十年在人的一生里意味着一个很长的时期。
Eighty dollars are enough for a student to spend on food for one week.八十块钱给一个学生吃一个月的伙食是足够的了。
3) 形容词前加定冠词即"the + 形容词"作主语时，其意义若是指个人或是抽象概念应看作单数，谓语动词用单数；但如果其意义是指一类人则应该看作是复数，那么谓语动词 也应该用复数。例如：
The young, on the one hand, often think of the old conservative. On the other hand, the old always consider the young inexperience.
一方面，青年人常认为老年人保守；另一方面，老年人总是认为青年人没有经验。
In many stories, the good are well rewarded and the bad are doomed to unfortunate. 在许多故事里，好人总是有好报；坏人注定要倒霉。
4）当and连接两个并列主语在意义上指同一人、同一物、同一事或者同一概念时，应看作 单数，谓语动词用单数。另外，当and 连接两个形容词去修饰一个单数形式的主语时，其实是指两种不同的事物,主语则应该看作是复数， 那么谓语动词也应该用复数。例如：War and peace is a constant theme in history. 战争与和平是一个历史上的永恒的主题。
Chinese and Japanese silk are of good quality.
中国丝绸和日本丝绸质量都很好。
Different people respectively welcome White and black coffee.
加奶的咖啡与清咖啡都分别受到不同人们的喜爱。
5) 集体名词作主语时，谓语动词的数取决于主语的意义：主语表示整体时视为单数，谓语动词用单数；主语表示集体中的个体成员时视为复数，谓语动词用复数。这类集体名词常见的有：army, audience, cattle, class, club, committee, crowd, family, government, group, majority, minority, part, people, police, public, staff, team等等，其中cattle，people，police一般看成复数形式。例如：
The family are all fond of football. 那一家人都喜欢足球。
The family is the tiniest cell of the society. 家庭是社会的最小的细胞。
The public has every reason to be cautious of professional deception.
人民大众完全有理由谨防职业骗局。
The public now come to know the whole story.
人们现在越来越清楚那是怎么回事了。
就近原则( Principle of Proximity )
这一原则是指，谓语动词的人称和数常常与最近作主语的词语保持一致。常出现在这类句子中的连词有：or, either… or …, neither… nor … ,not only… but also …等。例如：
Either I or they are responsible for the result of the matter.
不是我，就是他们要对那件事的结局负责任。
Neither the unkind words nor the unfriendly attitude has caused me any distress.既不是那些不友好的话，也不是那不友好的态度让我沮丧。
Not only he but also all his family are keen on concerts.
不仅仅是他，而且是他全家人都很热衷于音乐会。
Neither his family nor he knows anything about it.
他全家人和他都不知道那件事。
主谓一致
主谓一致是指：
1） 语法形式上要一致，即单复数形式与谓语要一致。
2） 意义上要一致，即主语意义上的单复数要与谓语的单复数形式一致。
3） 就近原则，即谓语动词的单复形式取决于最靠近它的词语，
一般来说，不可数名词用动词单数，可数名词复数用动词复数。
There is much water in the thermos.
但当不可数名词前有表示数量的复数名词时，谓语动词用复数形式。
e.g. Ten thousand tons of coal were produced last year.
Large quantities of water are needed.
In western countries, mountains of rubbish are thrown away each day.
1 并列结构作主语时谓语用复数
Reading and writing are very important.
注意： 当主语由and连结时，如果它表示一个单一的概念，即指同一人或同一物时，谓语动词用单数，and 此时连接的两个词前只有一个冠词。
The iron and steel industry is very important to our life.
典型例题
The League secretary and monitor ___ asked to make a speech at the meeting.
A. is B. was C. are D. were
答案B. 注： 先从时态上考虑。这是过去发生的事情应用过去时，先排除A.，C.。本题易误选D，因为The League secretary and monitor 好像是两个人，但仔细辨别， monitor 前没有the，在英语中，当一人兼数职时只在第一个职务前加定冠词。后面的职务用and 相连。这样本题主语为一个人，所以应选B。
2 主谓一致中的靠近原则
1) 当there be 句型的主语是一系列事物时，谓语应与最邻近的主语保持一致。
There is a pen, a knife and several books on the desk..
There are twenty boy-students and twenty-three girl-students in the class.
2）当either… or… 与neither… nor， 连接两个主语时，谓语动词与最邻近的主语保持一致。 如果句子是由here, there引导，而主语又不止一个时，谓语通常也和最邻近的主语一致。
Either you or she is to go.
Here is a pen, a few envelopes and some paper for you.
3 谓语动词与前面的主语一致
当主语后面跟有with, together with, like, except, but, no less than, as well as 等词引起的短语时，谓语动词与前面的主语一致。
The teacher together with some students is visiting the factory.
He as well as I wants to go boating.
4 谓语需用单数
1） 代词each和由every, some, no, any等构成的复合代词作主语，或主语中含有each, every, 谓语需用单数。
Each of us has a tape-recorder.
There is something wrong with my watch.
2） 当主语是一本书或一条格言时，谓语动词常用单数。
The Arabian Night is a book known to lovers of English.
<<天方夜谭>>是英语爱好者熟悉的一本好书。
3） 表示金钱，时间，价格或度量衡的复合名词作主语 时，通常把这些名词看作一个整体，谓语一般用单数。(用复数也可，意思不变。)
Three weeks was allowed for making the necessary preparations.
Ten yuan is enough.
5 指代意义决定谓语的单复数
1） 在代词what, which, who, none, some, any, more, most, all等词的单复数由其指代的词的单复数决定。
All is right. (一切顺利。)
All are present. (所有人都到齐了。)
2） 集体名词作主语时，谓语的数要根据主语的意思来决定。如family, audience, crew, crowd, class, company, committee等词后用复数形式时，意为这个集体中的各个成员，用单数时表示该个集体。
His family isn't very large. 他家不是一个大家庭。
His family are music lovers. 他的家人都是音乐爱好者。
但集合名词people, police, cattle, poultry等在任何情况下都用复数形式。
Are there any police around?
3）有些名词，如variety, number, population, proportion, majority 等有时看作单数，有时看作复数。
A number of +名词复数+复数动词。
The number of +名词复数+单数动词。
A number of books have lent out.
The majority of the students like English.
6 与后接名词或代词保持一致
1） 用half of, part of, most of, a portion of 等词引起主语时，动词通常与of后面的名词，代词保持一致。
Most of his money is spent on books.
Most of the students are taking an active part in sports.
2） 在一些短语，如 many a 或 more than one 所修饰的词作主语时，谓语动词多用单数形式。但由more than… of 作主语时，动词应与其后的名词或代词保持一致。
Many a person has read the novel. 许多人都读过这本书。
More than 60 percent of the students are from the city.百分之六十多的学生都来自这个城市
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