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
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
Bread and butter is my fa