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。