1、以单数名词或代词、不定式、动名词短语或从句作主语时，谓语动词要用单数形式。如： 1）The book is on the table. 2）He is reading English. 3）To work hard is necessary.（It is necessary to work hard.） 4）How you get there is a problem.
2、复数主语跟复数动词。如：Children like to play toys.
3、在倒装句中，动词的数应和它后面的主语的数一致。如以here,there开头，be 动词与后面第一个名词一致。如： 1）There is a dog near the door. 2）There were no schools in this area before liberation. 3）Her脑外伤癫痫病的早期治疗e comes the bus. 4）On the wall were two famous paintings. 5）Here is Mr Brown and his children.
4、and连接两个或两个以上的并列主语时，谓语动词用复数。如果主语后跟有with, together with, except, but, perhaps , like, including, as well as, no less than, more than, rather than等引起的短语，谓语动词仍与短语前的主语的形式保持一致。如： 1）Jane, Mary and I are good friends. 2）He and my father work in the same factory. 3）His sister, no less than you, is wrong. 4）The father, rather than the brothers, is responsible for the accident. 5）He, like you and Xiao Liu is very diligent. 6）Every picture except the日照羊癫疯什么医院好se two has been sold. 7）Alice with her parents often goes to the park on Sundays. 8）Alice as well as her friends was invited to the concert. 9）Nobody but Mary and I was in the classroom at that time.
5、并列主语如果指的是同一个人、同一事物或同一概念时，谓语动词用单数，and后面的名词没有冠词。如： 1）The writer and worker is coming to our school tomorrow. 这位工人作家明天要来我们学校。 2）Bread and butter is their daily food. 面包和黄油是他们每日的食品。 3）The writer and the worker are coming to our school tomorrow. 那位作家和那位工人明天将来我们学校。
6、and连接的并列单数名词前如有each, every, no, many a修饰时，谓语动词要用单数形式。羊癫疯大发作的症状如： 1）Every boy and girl has been invited to the party. 所有的孩子都被邀请参加这次聚会。 2）No teacher and no student is absent today. 今天没有老师和学生缺席。 3）Many a student is busy with their lessons. 许许多多的学生都忙着复习他们的功课。
7、each, either, one, another, the other, neither作主语时，谓语动词用单数形式。如： 1）Each takes a cup of tea. 2）Either is correct. 3）Neither of them likes this picture.
8、由every, some, any, no构成的合成代词作主语时，谓语动词用单数形式。如： 1）Is everyone here? 2）Nothing is to be done. 没有什么要干的事儿了。
9、关系代词who, that, which等在定语从句中作主语时，其谓语动词的数应与句中先行词的数一致。如： 癫痫病吃什么药最好1）Those who want to go please sign their names here. 2）Anyone who is against this opinion may speak out. 3）He is one of the students who were praised at the meeting.
10、表示时间、距离、价格、度量衡等的复数名词或短语作为一个整体看待时，其谓语动词常用单数形式。如： 1）Three years is not a long time. 2）Ten dollars is what he needs. 3）Five hundred miles is a long distance.
11、复数形式的专有名词作为整体看待（如人名、地点、国家、组织、书籍、报刊等），动词用单数形式。如： 1）The United States is in North America. 2）The United Nations has passed a resolution（决议）。 3）“The Arabian Nights”（《天方夜谭》）is an interesting book.