一致关系
英语的一致有三种:主谓一致，代词一致，肯定与否定一致
(一)主语与谓语的一致
英语语法要求，主语如果是单数，谓语动词也要用单数形式;主语若是复数，谓语动词也要用复数形式
例如:
She likes to eat well.她好吃
We all like good food.我们都喜欢好饭菜。
Everybody was happy with the decision. 人人都对这个决定感到高兴。
I am a doctor.我是个医生。
(二)概念一致
1. And连接的两个或多个单数名词作主语时，谓语动词用复数形式
His opinion and mine are different他的观点和我的是不同的。
Bob and Peter are deadly rivals. Bob和peter是死对头。
What she says and what she does are totally different. 她说的和做的完全不同。
但是如果and连接的是指一个单一概念时，谓语动词用单数。
Bread and milk has been my breakfast for years. 牛奶面包多年来一直是我的早餐。
Her lawyer and old friend is going to marry her.她的律师和老朋友要娶她。
All this effort and sacrifice has come to nothing. 所有这些努力和牺牲都白费了。
由and连接的单数主语分别有many a，ever y，each，no修饰时，动词用单数。
如：During the holidays, every train and every plane was crowded.假期期间每列火车及每架飞机都非常拥挤。
No boy and no girl has the right to refuse education. 男孩和女孩都没有拒绝教育的权利。
Man a man and man a woman was moved b this picture。许多男男女女都被这幅画感动。
2.如果主语是一个抽象概念(如不定式、动名词、主语从句等)谓语动词用单数形式。如果主语是用and连接的两个或多个抽象概念，谓语动词用复数形式。
如：Swimming jogging and cycling are all goad farms of sports exercises.游泳、慢跑和骑自行车都是很好的运动形式。
To live to eat is not a very goad attitude toward life. 活着就是为了吃不是好的生活态度。
To live to eat and to eat to live are very different attitudes toward life.
以what，who，why，haw, whether等wh一词引起的从句做主语时，谓语动词通常用单数;由and连接的两个主句如果指两件事，动词用复数。
例如:What he is doing is not clear yet他在干什么还不清楚
What he is doing and whether I know him are two different things.他在干什么和我是否认识他是两件不同的事。
What she told me is none of your business. 她和我说的什么用不着你管。
What she told me and what she told you are totally different things.
英语十二大基础语法体系8：一致关系
以what从句为主语的“主一系一表SVC"句型中，如果主句的表语是复数，主句谓语动词用复数形式;what从句本身是复数意义，主句谓语动词也可用复数。
如：What I need buy now are four tea cups and a pair of sports shoes.
我需要买的是四只茶杯和一双运动鞋。
What were thought to be five dogs were actually five sheep.
被认为是五条狗的东西实际上是五只羊。
3.集体名词family，class，crew(全体船员或机组人员)，crowd, group, committee, audience, government, public, team, staff, population等做主语时，若作为一个整体看待，后面谓语动词用单数; 如就其中每一个成员来考虑时，则用复数。
例如: My family is a big one.我家人多。
My family are all music lovers. 我全家人都爱好音乐。
Eighty percent of China\' s population are peasants. 百分之八十的中国人口是农民。
China has a huge population. 中国有众多的人口。
The population of China is the largest in the world. 中国的人口是世界上最多的。
People, police, cattle,(牛)，militia(民兵)，poultry(家禽)，vermin(害出)等作主语时，后面的动词要用复数。
4.不定代词either，neither，ever y，each，one，the other, another以及所有的复合不定代词作主语时，谓语动词只用单数，包括“every/each/no……and every/each/no……”作主语时。
如：Every/Each plane and every/each pilot is ready to take off.
每架飞机和每个飞行员都已准备好起飞。
No plane and no pilot is ready to take off.
没有一架飞机、没有一个飞行员已准备好起飞。
Here are two books. Either of them is worth reading.
这有两本书，都值得一读。
Neither of these two dictionaries contains this ward.
这两本词典都没收入这个字
Everyone is here. No one is absent. 大家都到了，没有人缺席。
知识拓展：
主谓一致的讲解
语法意义的一致
1， 金额，距离，体积，重量，面积，数量，国家，人名，机构，事件，作品时，单数
Two dollars is enough 两美元是足够的
Two meters is long 两米很长
Two kilos is heavy 两公斤很重
Twenty-one is a big number 21是一个很大的数字
The United States is a big country 美国是一个大的国家
2,非谓语动词：
Reading books is good for you 阅读书对你来说很好
To study English well is necessary去学习好英语是很有必要的。
2， 不定代词：
No one is here 没有一个人在这里
3， 人类，世界上的人类
Only man thinks how to be better 只有人类才思考如何变得更好。
4， 其他用法
1， Many a singer has been here 许多歌手都到过这里。
2， More than one boy has the book 不止一个男孩有这本书
3， More boys than one does housework at home不止一个男孩在家都是做家务的。
4， One and a half apples is here 还有一个半的苹果在这里。
5，a boy or two has been here 一两个学生到过这里。
5， one or two boys have been here 一两个学生到过这里
谓语复数：
1， 集体名词：
The police are chasing the thief 警察正在追捕这个小偷
2， 专有名词：
The Himalayas is a big mountain喜马拉雅是一个很大的山。
3， the 加形容词（国家的，民族的）
The rich are here 有钱人们都在这里
The Chinese are the best 中华民族是最棒的
特殊用法：
1， three fourths books are here 四分之三的书是在这里的。
2，a quantity/an amount of books is here 大量的书在这里
2， Quantities/amounts of books are here 大量的书在这里
3， The majority is /are here大多数人在这里
4， This kind of books is good =books of this kind ar