1.由 many a 或 more than + 单数名词作主语时，其谓语用单数形式。
Many a foreigner has been to the Great Wall.
More than one student has visited the exhibition.
2.“……的几分之几”和“……的百分之几” 作主语时，其谓语用单数或复数取决于 of 后的名词。 Three-fourths of the surface of the earth is sea.
40 percent of the students in our class are girls.
3.“a number of + 名词复数”作主语，谓语用复数;“ the number of + 名词复数”作主语，谓语用单数。 A number of pupils like reading picture-books.
The number of the students in our class is 55.
4.并列主语如果指的是同一人、同一物或同一概念，谓语动词用单数，这时 and 后面的名词前没有冠词。 The secretary of the Party branch and director of that factory often works with the workers. 5.成对的名词，如bread and butter涂黄油的面包，soda and water汽水，coffee and milk加牛奶的咖啡，aim and end目的，salt and water盐开水等，虽然有and连接，但仍表单一概念，作主语时，谓语用单数。
A knife and fork is on the table.
6.由 and 连接的并列单数主语的前面分别有each, every或no修饰时，其谓语用单数形式。
No student and no teacher is invited to the party.
In our country every boy and every girl has right to receive education.
7.主语是单数，其后跟有together with, along with (与……一道)，as well as (和;也)，no less than (和……一样)，rather than (而不)，以及with, not, like, but, except, besides, including 等引起的短语时，谓语动词一般用单数形式。
He as well as his sister is a League member.
8.在定语从句中主语是关系代词who, that, which,谓语动词的数应与先行词的数一致。
I, who am your teacher, will teach you everything I know.
9.主语是一些只有复数形式的名词，如clothes, trousers, glasses, compasses, scissors, shoes, socks, gloves等时，谓语用复数。但这类表示成双的东西的名词前有a pair of修饰时，谓语用单数。
My trousers are being washed now.
There is a pair of shoes in the box.
Ten dollars is not enough.
Three months has passed since he left.
11.主语是以-ics 结尾的学科名词以及news, works (工厂)等都属形式复数，而意义单数的名词，其谓语用单数形式。另外means一词单复数同形应视具体情况而定。
Mathematics seems to be difficult to learn.
A new means of teaching is being used in that school.
The United States is a developed country.
13.主语是family, team, group, crowd, class, committee等集合名词时，如果作为一个整体看待，谓语用单数形式，如指的是全体人员时，谓语用复数。
His family are all music lovers.
14.“one of + 复数名词 + 定语从句”之前有the only, the very, the等限定词和修饰语时，定语从句的谓语动词用单数形式。
She is the only one of these women who plays the violin.
15.主语是疑问代词who, what, which,不定代词all, more, most, any, none等以及名词half, part, the rest等既可表示复数意义又可表示单数意义，其谓语视情况而定。
Half of the visitors are from Europe.
Half of the fruit is bad.
16.主语是表示数量的“one and a half +复数名词”，其谓语用单数形式。主语是“one or two + 复数名词”，其谓语用复数形式。
One and a half bananas is left on the table.
There are one or two things I‘d like to know about.
The rich are not always happy.
The new is sure to replace the old.
18.由not only … but also, neither…nor, either…or, not …but以及or连接的并列主语，谓语动词要与最靠近它的主语在数上保持一致。
Not only your father's friends but also your father likes smoking.
19.在倒装句中以及在There be …结构中，如主语是并列的，谓语动词往往和其后面的第一个主语取得数上的一致。
Where is your mother and younger sister?
There is a pen , two pencils and five books on the desk.
When and where to build the new factory is not decided yet.