主谓一致的基本原则
1） 语法一致原则
The boy has failed his exams and will have to take them again.
2） 意义一致原则
The police are still in search of the murderer.
3） 就近原则
Neither Jane’s mother nor her father is at home.
2. 以-s结尾的名词作主语
大部分以-s结尾的名词是复数含义
The goods are to be delivered soon.
但也有一些以-s结尾的名词是单数含义
The United States is a melting pot
3） 表示山脉、海峡等的复数形式的地理名词，动词为复数形式。
一些以-s结尾的名词单数和复数形式相同。
Every means has been tried out.
3. 集合名词作主语
1) 有些集合名词永远为复数含义，动词为复数形式。
The police have closed the case.
2) 有些集合名词永远为抽象含义，动词为单数形式。
The merchandise is attractively displayed and the assistants are friendly and helpful.
3) 既能作复数，又能作单数的集合名词。
My family are taking separate vacations.
His family is a big one.
4. 一词多义的名词作主语
一些名词同时具有几种含义，单复数意义也不同。
His arm is broken
The nuclear arms have been disposed of.
5.熟记规则，多看原文，对照分析，仔细琢磨。