巧学英语语法：主谓一致的三个原则
1. 语法一致原则该原则要求谓语动词必须与主语在语法形式上保持一致，即主语是单数形式，动词用单数形式，主语是复数形式，动词用复数形式：
Both my parents are doctors. 我的父母都是医生。
The living-room walls are a light yellow. 客厅的墙是淡黄色。
The two factories are in the same locality. 两家工厂都在同一个地区。
Her job is teaching French. 她的工作是教法语。
The location of the house is near the highway. 房子的地点靠近公路。
A large amount of damage was done in a short time. 短期内造成大量损害。
2. 意义一致原则
有时候谓语动词的数取决于主语所表示的概念，而不是其语法形式：
This news is important for us. 这条消息对我们很重要。
Paris is among the largest cities in the would. 巴黎是世界上最大的城市之一。
The thesis was about a hundred and fifty pages long. 论文有一百五十页长。
Watch out! The police are coming. 当心，警察来了。
Less people are going to university than usual. 现在上大学的人比平时少。
3. 就近原则
有时，谓语动词的数决定于主语中最靠近它的词语：
Either you or I am wrong. 不是你错了就是我错了。
Neither the students nor the teacher is interested in it. 老师和学生对此都不感兴趣。
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