2.形复意单的名词作主语时谓语动词也有用复数形式的。 1）trousers, stockings, socks, pants, scissors, glasses, shoes, jeans等有成双部分的衣服或物品的名词。 His trousers have worn out 2) riches, contents, surroundings.等抽象名词。 Riches have wings.财富不久远。

　　3.people, police, cattle等名词形单意复，作主语时，谓语动词用复数形式。 The police have caught the murderer.

　　4．集合名词一般具有单数形式，但单数形式的集合名词往往也有复数意义。 My family is active. My family are early risers. The two families live in BeiJing.

　　5．具有并列关系的名词作并列主语时，有以下情况。 1）and, both……and……连接的主语有复数意义时谓语动词用复数形式。 Both my sister and my cousin study in Shanghai. 2)and连接的并列主语指同一个人或物时，谓语动词用单数形式。 The writer and poet is here. 3)有几个并列的形容词修饰的名词作主语时，动词要与主语所含蓄的数一致。 Simple and plain living is a fine quality。简朴的生活对身体有益。 4）当not…but…,not only…but(also)…连接并列主语时，谓语动词要和它紧邻的主语一致。 Not one but all of them are good. 5) or, either…or…,neither…nor…连接并列主语时，谓语动词的数要和它紧邻的主语一致。 A few note books or some paper is what I need.

　　6. each, either, neither, one, the other, anyone, anybody, anything等不定代词通常用作单数，但实际上有时也可用作复数。 Each takes a cup of coffee. I invited both Peter and John, but neither have come, I wonder if either are coming.

　　7．在传统语法中，词组应作单数对待。 1）表示时间、价格、距离、度量衡等单一概念的词组，谓语动词用单数形式。 Ten months is enough for them to make a round trip. 2）数词词组和算式都看作单一的整体。 One of tenth has been assigned to do the decoration. 注意：如果这类词在句中表达的概念有复数意义，在非正式文体和习惯用法中谓语动词也可根据概念一致原则和就近原则使用复数形式。 Fifty percent of the passengers have survived the shipwreck.

　　8.从句、不定式、v-ing形式等作主语时，在传统语法中通常看作单数。 That I shall work with you is a great pleasure. To understand him is impossible. 注意：1）What从句的内容如果含有复数概念，谓语动词用复数形式。 What were your problems a year ago have become my problems now. 2）含有并列谓语的what从句作主语时谓语动词要遵循概念一致原则。 What he says and does do not agree. 3）并列的what从句作主语时，谓语动词的数可以是单数，也可以是复数。 What he says what he does do not agree.

　　9．习惯用法。 1）"more than+名词词组"做主语时，动词的数要和词组中心词的数一致。 More than two hundred people have come. 2）"many a+单数名词"做主语时，谓语动词用单数。 Many a student has made that mistake.