8. 表示时间，距离，度量，价值的复数名词作主语时，谓语动词的单
复数情况。
这些复数名词，如表示抽象概念，被视作一整体时，谓语动词用单数
形式。
Forty minutes is enough for the work.
Twenty pounds is too expensive.
如强调这类词的复数意义，则谓语动词要用复数形式。
Thirty kilos of water are used every day.
注意：
分数和百分数修饰名词作主语时，谓语的单复数取决于名词。
Only 20% of the work was done.
About 20% of the students are absent.
Two thirds of the books are worth reading.
9. 由表示“种类，数量，单位的名词+of”修饰名词作主语时，其动
词往往与表示“种类，数量，单位的名词”保护一致。
There is a kind of roses in the garden.
There are many kinds of apples.
Three million tons of coal were exported last year.
Two piece of cake were divided among the children.
10. the number of +名词复数，是表示“......的数量”，作主语时，谓语
动词用单数形式。
a (large/great) number of +名词复数，表示许多，作主语时，谓语动词
复数情况。
这些复数名词，如表示抽象概念，被视作一整体时，谓语动词用单数
形式。
Forty minutes is enough for the work.
Twenty pounds is too expensive.
如强调这类词的复数意义，则谓语动词要用复数形式。
Thirty kilos of water are used every day.
注意：
分数和百分数修饰名词作主语时，谓语的单复数取决于名词。
Only 20% of the work was done.
About 20% of the students are absent.
Two thirds of the books are worth reading.
9. 由表示“种类，数量，单位的名词+of”修饰名词作主语时，其动
词往往与表示“种类，数量，单位的名词”保护一致。
There is a kind of roses in the garden.
There are many kinds of apples.
Three million tons of coal were exported last year.
Two piece of cake were divided among the children.
10. the number of +名词复数，是表示“......的数量”，作主语时，谓语
动词用单数形式。
a (large/great) number of +名词复数，表示许多，作主语时，谓语动词
