主谓一致（Subject- Verb Agreement）
主谓一致指“人称”和“数”方面的一致关系。如：He is going abroad. They are playing football.
可分为：语法一致，内容一致，就近一致。

（一）语法一致原则：
即主语为单数，谓语用单数；主语为复数，谓语也用复数。以下为注意事项：
1．单数主语即使后面带有with，along with，together with，like（象），but（除了），except，besides，as well as，no less than，rather than（而不是），including，in addition to 引导的短语，谓语动词仍用单数。如：
Air as well as water is matter. 空气和水都是物质.
No one except two servants was late for the dinner. 除了两个仆人外，没有一个人迟来用餐。
2．用and连接的并列主语，如果主语是同一个人，同一事，同一概念，谓语动词用单数，否则用复数。如：
The poet and writer has come. 那位诗人兼作家来了。（一个人）
A hammer and a saw are useful tools. 锤子和锯都是有用的工具. （两样物）
用and连接的成对名词习惯上被看成是一个整体，如：bread and butter（黄油抹面包），knife and fork（刀叉）等作主语时，谓语动词用单数。
3．不定式（短语），动名词（短语），或从句作主语时，谓语动词用单数。如：
Serving the people is my great happiness.为人民服务是我最大的幸福。
When we’ll go out for an outing has been decided.我们什么时候出去郊游已决定了。
4．用连接的并列主语被each，every 或no修饰时，谓语动词用单数.
Every boy and every girl likes to go swimming. 每个男孩和每个女孩都喜欢去游泳。
No teacher and no student was absent from the meeting. 没有老师也没有学生开会缺席。
Each man and （each） woman is asked to help. 每个男人和每个女人都被请去帮忙。
5．each of + 复数代词，谓语动词用单数. 复数代词+each，谓语动词用单数。如：
Each of us has something to say. 我们每个人都有话要说
6． 若主语中有more than one 或many a/an ，尽管从意义上看是复数，但它的谓语动词仍用单数，但more+复数名词+than one做主语时，谓语动词仍用复数。如：
Many a boy likes playing basketball. 许多男生都喜欢打篮球。
More than one student was late.不只一个学生迟到。
More persons than one come to help us. 不止一个人来帮助我们。
7．none 做主语时，谓语动词可用单数，也可用复数；但在代表不可数的东西时总是看作单数，因而谓语动词要用单数。如：
    None of us are（is）perfect. 人无完人.
    None of this worries me. 这事一点不使我着急.
8．名词如：trousers，scissors，clothes，goods，glasses 等作主语时，谓语动词必须用复数。如：
His clothes are good. 但这些名词前若出现 a pair of，谓语一般用单数。如：
A pair of glasses is on the desk.. 桌上有一副眼镜.
9．形复意单名词如：news；以ics 结尾的学科名称如：physics，mathematics，economics；国名如：the United States；报纸名如：the New Times；书名如：Arabian Night《天方夜谈》；以及The United Nations“联合国”等作主语时，谓语动词用单数。
10．“a +名词+and a half”，“one and a half + 名词”，“the number of + 名词”等作主语时，谓语动词要用单数。如：
Only one and a half apples is left on the table.
注意：one or two + 复数名词作主语，谓语动词用复数形式，如：
One or two places have been visited. 参观了一两个地点。

（二）内容一致原则：
1．主语中有all，half，most，the rest等，以及”分数或百分数+名词”做主语时，谓语动词单复数取决于连用的名词.如：
The rest of the bikes are on sale today.    剩下的自行车，今天出售.
60%of the apple was eaten by little boy.   这个苹果的60%都被这个小男孩吃了.
Most of the apples were rotten.       大部分的苹果都是烂的.
Most of the apple was eaten by a rat.  这个苹果的大部分被老鼠吃了.
2．不定数量的词组，如：part of ，a lot of ，lots of ，one of ，a number of ，plenty of等作主语时，谓语动词的单复数取决于量词后面名词的数.如：
A part of the textbooks have arrived.  一小部分教科书已运到.
A part of the apple has been eaten up by the pig.  这个苹果的一部分被猪吃光了.
3．加减乘除用单数.如：
    Fifteen minus five is ten . 15减去5等于10.
4．表示时间，金钱，距离，度量等的名词做主语时，尽管是复数形式，它们做为一个单一的概念时，其谓语动词用单数.如：
Ten miles is a good distance. 十英里是一个相当的距离.
5．（1）通常作复数的集体名词. 包括police ，people，cattle 等，这些集体名词通常用作复数.如：
   The British police have only very limited powers.
  （2）通常作不可数名词的集体名词. 包括equipment，furniture，clothing，luggage 等.
  （3）可作单数也可作复数的集体名词. 包括 audience，committee，government，family，enemy，group，party，team，public 等.如：
    The committee has/have decided to dismiss him. 委员会决定解雇他.
6．the +形容词/过去分词形式”表示一类人或事物，作主语时，谓语动词用复数.如：
The injured were saved after the fire.

（三）就近原则：
1．由here，there，where 等引导的倒装句中，（有时主语不止一个时）谓语动词与靠近它的主语在数上一致.如：
Here comes the bus 公共汽车来了.
Here is a pen and some pieces of paper for you.  给你一支钢笔和几张纸
Where is your wife and children to stay while you are away?
你不在这儿的时候，你爱人和孩子在哪儿呆呢?
2．用连词or，either.... or，neither….nor，not only….but also 等连接的并列主语，谓语动词与靠近它的主语在数上一致. 如：
Neither the students nor the teacher knows anything about it 学生和老师都不知道这事.
He or you have taken my pen. 他或你拿了我的钢笔.
注意：one of +复数名词+who/that/which 引导的定语从句中，定语从句的动词为复数.如：
Mary is one of those people who keep pets. 玛丽是饲养宠物者之一.
The only one of +复数名词+ who/that./which 引导的定语从句中，定语从句的动词应为单数.
Mary is the only one of those people who keeps pets. 玛丽是唯一一个饲养宠物的人.

主谓一致练习
1. About 60 percent of the students _____ from the south，the rest of them _____ from the north and foreign countries.
A. are/is    B. are/are　  C. is/are    D. are
2. Half of the workers here _____ under 30 _____.
　A. is/years      B. are/year old   C. is/years old   D. are/years of age
3. Now Tom with his classmates _____ football on the playground.
　A. play     B. are playing　 C. plays    D. is playing
4. The number of pages in this dictionary _____ about two thousand.
　A. are      B. has　   C. have     D. is