4. 谓语需用单数的情况
1）代词each以及由every, some, no, any等构成的复合代词作主语时，或主语中含有each, every时, 谓语需用单数。例如：
Each of us has a tape-recorder. 我们每人都有录音机。
There is something wrong with my watch. 我的表坏了。
2）当主语是一本书或一条格言时，谓语动词常用单数。例如：
The Arabian Night is a book known to lovers of English. 《天方夜谭》是英语爱好者熟悉的一本书。
3）表示金钱，时间，价格或度量衡的复合名词作主语时，通常把这些名词看作一个整体，谓语一般用单数。例如：
Three weeks was allowed for making the necessary preparations. 用三个星期来做准备。
Ten yuan is enough. 十元够了。
5.指代意义决定谓语的单复数
1）代词what, which, who, none, some, any, more, most, all等词的单复数由其指代的词的单复数决定。例如：
All is right. 一切顺利。
All are present. 人都到齐了。
2）集体名词作主语时，谓语的数要根据主语的意思来决定。如family, audience, crew, crowd, class, company, committee等词后，谓语动词用复数形式时强调这个集体中的各个成员，用单数时强调该集体的整体。例如：
His family isn't very large. 他家成员不多。
His family are music lovers. 他家个个都是音乐爱好者。
但集合名词people, police, cattle, poultry等在任何情况下都用复数形式。例如：
Are there any police around? 附近有警察吗？
3）有些名词，如variety, number, population, proportion, majority 等有时看作单数，有时看作复数。例如：
A number of +名词复数+复数动词。
The number of +名词复数+单数动词。
A number of books have lent out.
The majority of the students like English.
6.与后接名词或代词保持一致的情况
1）用half of, most of, none of, heaps of, lots of, plenty of 等引起主语时，谓语动词通常与of后面的名词/代词保持一致。例如：
Most of his money is spent on books. 他大部分的钱化在书上了。
Most of the students are taking an active part in sports. 大部分学生积极参与体育运动。
2）用a portion of, a series of, a pile of, a panel of 等引起主语时，谓语动词通常用单数。例如： A series of accidents has been reported. 媒体报道了一连串的事故。
A pile of lots was set beside the hearth. 炉边有一堆木柴。
3）如 many a 或 more than one 所修饰的短语作主语时，谓语动词多用单数形式。但由more than… of 作主语时，动词应与其后的名词或代词保持一致。例如：
Many a person has read the novel. 许多人读过这本书。
More than 60 percent of the students are from the city.百分之六十多的学生来自这个城市。