英語的一致有三種：主謂一致，代詞一致，肯定與否定一致。
(二)概念一致
1、And連接的兩個或多個單數名詞作主語時，謂語動詞用複數形式
His opinion and mine are different他的觀點和我的是不同的。
Bob and Peter are deadly rivals. Bob和peter是死對頭。
What she says and what she does are totally different. 她說的和做的完全不同。
但是如果and連接的是指一個單一概念時，謂語動詞用單數。
Bread and milk has been my breakfast for years. 牛奶麵包多年來一直是我的早餐。
Her lawyer and old friend is going to marry her.她的律師和老朋友要娶她。
All this effort and sacrifice has come to nothing. 所有這些努力和犧牲都白費了。
由and連接的單數主語分別有many a，ever y，each，no修飾時，動詞用單數。
例如：
During the holidays, every train and every plane was crowded.假期期間每列火車及每架飛機都非常擁擠。
No boy and no girl has the right to refuse education. 男孩和女孩都沒有拒絕教育的權利。
Man a man and man a woman was moved b this picture。許多男男女女都被這幅畫感動。
2、如果主語是一個抽象概念(如不定式、動名詞、主語從句等)謂語動詞用單數形式。
如果主語是用and連接的兩個或多個抽象概念，謂語動詞用複數形式。
例如：
Swimming jogging and cycling are all goad farms of sports exercises.游泳、慢跑和騎自行車都是很好的運動形式。
To live to eat is not a very goad attitude toward life. 活著就是為了吃不是好的生活態度。
To live to eat and to eat to live are very different attitudes toward life.
以what，who，why，haw, whether等wh一詞引起的從句做主語時，謂語動詞通常用單數;
由and連接的兩個主句如果指兩件事，動詞用複數。
例如：
What he is doing is not clear yet他在幹什麼還不清楚
What he is doing and whether I know him are two different things.他在幹什麼和我是否認識他是兩件不同的事。
What she told me is none of your business. 她和我說的什麼用不著你管。
What she told me and what she told you are totally different things.
以what從句為主語的“主一系一表SVC"句型中，如果主句的表語是複數，主句謂語動詞用複數形式；what從句本身是複數意義，主句謂語動詞也可用複數。
例如：
What I need buy now are four tea cups and a pair of sports shoes.
我需要買的是四隻茶杯和一雙運動鞋。
What were thought to be five dogs were actually five sheep.
被認為是五條狗的東西實際上是五隻羊。
3、集體名詞family，class，crew(全體船員或機組人員)，crowd, group, committee, audience, government, public, team, staff, population等做主語時，若作為一個整體看待，後面謂語動詞用單數; 如就其中每一個成員來考慮時，則用複數。
例如：
My family is a big one.我家人多。
My family are all music lovers. 我全家人都愛好音樂。
Eighty percent of China\' s population are peasants. 百分之八十的中國人口是農民。
China has a huge population. 中國有眾多的人口。
The population of China is the largest in the world. 中國的人口是世界上最多的。
People, police, cattle,(牛)，militia(民兵)，poultry(家禽)，vermin(害出)等作主語時，後面的動詞要用複數。
4、不定代詞either，neither，ever y，each，one，the other, another以及所有的複合不定代詞作主語時，謂語動詞只用單數，包括“every/each/no……and every/each/no……”作主語時。
例如：
Every/Each plane and every/each pilot is ready to take off.
每架飛機和每個飛行員都已準備好起飛。
No plane and no pilot is ready to take off.
沒有一架飛機、沒有一個飛行員已準備好起飛。
Here are two books. Either of them is worth reading.
這有兩本書，都值得一讀。
Neither of these two dictionaries contains this ward.
這兩本詞典都沒收入這個字
Everyone is here. No one is absent. 大家都到了，沒有人缺席。
Somebody is using the phone. 有人在用電話。
I have two sisters. One is here, and the other is not here.
我有兩個姐妹，一個在這兒，一個不在這兒。
Each day is better than the one before. 一天比一天好。
Either day is OK. 兩天中哪一天都行。
5、what，who，which，any，mare，some，half，mast，all，none.等代詞可以是單數，也可以是複數，主要靠意思決定。但指不可數名詞時作單數看待。
6、表示時間、重量、長度、價值等的單位名詞，儘管是複數形式，如果作整體看待，動詞都用單數形式。如果看作組成該數量的一個一個的個體，則動詞用複數。
例如：
Twenty miles is a long way to walk. 走二十英里可是很長的一段路。
Ten years is a long time。十年很長。
Eight minutes is enough. 八分鐘夠了。
Twelve dollars is too dear. 十二美圓太貴了。
There are six silver dollars in each of the stacking. 每隻襪子裡有六個一美元的銀幣。
7、“the+形容詞”表示一類人時，謂語動詞用複數。表示抽象概念或指個別事物時謂語動詞用單數。
例如：
The old are well taken care of. 老人得到很好的照顧。
The beautiful is laved by all. 人人都愛美。
8、如果主語由"a kind/sort/type of this kind/sort/type of +名詞”組成，不管名詞是單數還是複數，動詞通常用單數。
例如：
This kind of man annoys me. =This kind of men annoys me. 這種人讓我煩。
This kind of apple is very expensive. = This kind of apples is…這種蘋果很貴。
類似的還有:a portion of(一部分)，a series of(一系列)，a pile of(一堆)，a panel of (一個小組委員會)
例如：
A series of accidents has happened here. 這裡發生過一系列事故。
9、Means作“方法、手段”講時，單複數同形，其前面有each, every, neither, either,等單數a唸的定語時，謂語動詞用單數;若有all, both，these等複數概念的定語時謂語動詞用複數。
“None of the means”作主語時，謂語動詞通常用單數。
例如：
There is/are no means of learning what is happening. 沒法知道正在發生什麼事。
No means is /are left untried. 沒有沒試過的方法了。
Every means is to an end. 每一種手段都能達到一種目的。
A bicycle is a means of transport. 自行車是一種交通手段。
All possible means have/Every possible means has been tried.所有的方法都試過了。
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